The invention discloses a switching experiment plug which relates to the field of circuit measurement. The switching experiment plug comprises a cylinder, a handle I, a handle II, a transmission rod I, a transmission rod II, terminals, a shaft sleeve and a ratchet. The cylinder is a hollow cylindrical member with an overlapped half side. The external wall of the cylinder is fixedly connected with a plurality of terminals. The outer layer of the overlapped part in the cylinder is fixedly connected with the transmission rod I, and furthermore the inner layer is fixedly connected with the transmission rod II. The other end of the transmission rod I is fixedly connected with the shaft sleeve. The shaft sleeve is internally provided with a shaft body. The lower end of the shaft body is connected with the transmission rod II through a pin. The upper end of the shaft sleeve is provided with a bidirectional ratchet relative to the shaft body. The outer wall of the ratchet is connected with the handle II. The top of the ratchet is provided with a dial disc. The upper end of the shaft body is connected with the handle I. The diameter of the cylinder provided by the invention can be randomly adjusted. The plug is suitable for trolley type circuit breaker plugs with different capacities. In use, contacting between the plug and an experiment wire clamp is more approximate to the working state of the circuit breaker, thereby realizing real and accurate experiment data.