The invention provides a same pipe diameter pressure equalizing structure of a crimping type IGBT valve. The structure comprises a top plate and a bottom plate arranged at two ends of an IGBT valve string, a threaded rod penetrating through the top plate and the bottom plate, and a nut arranged at two ends of the threaded rod through sleeving and contacting against the top plate and the bottom plate, wherein jacking blocks are respectively arranged between the top plate and an upper end of the IGBT valve string and between the bottom plate and a lower end of the IGBT valve string; and a truncated -cone type strain transmission component and a pressure equalizing ball are respectively arranged between the jacking blocks and the IGBT valve string. Based on a force transmission characteristicwhere stress on the pressure equalizing ball is concentrated at one point, a press-fitting force is concentrated at one point, then, the force concentrated at one point is scattered to a circular plane with specified radius through the strain transmission component, the circular plane can be a press-fitting table surface of the IGBT and also can be a water cooling heat dissipation plate heat-conducting plane, since the press-fitting table surface of the IGBT and the water cooling heat dissipation heat-conducting plane both are truncated -cone planes with same radius, transmission of the forceis even and consistent, with the mechanism, N IGBTs and N+1 heat sinks can be under even force and in a good press-fitting contact state.