A universal circuit magic board, consisting of a circuit experimental board and circuit components, characterized in that the circuit experimental board (for the sake of specific explanation, electronic circuits are used as examples below) is composed of a double-layer single-sided (or double-sided) printed circuit board of the same size (hereinafter referred to as the printed board), circuit component sockets (such as integrated component sockets, hereinafter referred to as sockets), and pins, A socket is welded into a metalized hole in a printed circuit board that is separated and insulated between the upper and lower layers. On the upper and lower sides centered on the horizontal centerline of the socket, a horizontal line parallel to the horizontal centerline of the socket is printed on the lower layer printed circuit board (or upper layer printed circuit board), and a vertical line perpendicular to the horizontal center of the socket is printed on the upper layer printed circuit board (or lower layer printed circuit board). The distance between the centers of adjacent lines in the horizontal and vertical directions is measured, The distance between the centers of two adjacent pins identical to the integrated part is 2.54mm. The width of the horizontal and vertical lines is determined by the current between the two connecting points, usually 0.30mm or more. On each line, every 2.54mm (the distance between the Centre-to-centre distance of two adjacent pins identical to the integrated part) interval, there is a metallized hole with the same aperture corresponding to each other on the upper and lower printed boards. The aperture size depends on the diameter of the pin, for example, 0.60mm-0.80mm, The longitudinal line on the upper printed board is connected with the pins of the socket and the metallized holes by welding. The pins can be Pin or other conductive metal pins that are the same as the metallized holes on the line, which is the lifting side of a circuit test board of the invention; The circuit components include electronic, electrical, motor, and instrument components. The circuit components equipped on the circuit experimental board of the present invention directly weld the fixed and unchanging parts of the circuit function onto the double-layer printed board, while the circuit connection points with multiple state changes in the circuit function can be changed by inserting or not inserting pins to achieve experiments or demonstrations of different circuit functions, The insertion method is to insert the pin according to the number of X coordinate points and Y coordinate points given by the circuit, and to perform functional experiments or demonstrations of the given circuit. All experiments and demonstrations show correct or incorrect results.