Pressure test device and method for hydraulic expansion well cementation and completion tool

The invention provides a pressure testing device and method for a hydraulic expansion well cementation and completion tool, and belongs to the technical field of oil and gas well cementation and completion tools. The device comprises a lower connector, and a liquid injection connector is connected to the lower connector; or the pressure testing device comprises a lower joint, one end of the lower joint is connected with an upper blind plate, the middle of the pipe wall of the lower joint is sleeved with an upper bearing plate, a first cover plate is arranged outside the lower joint, the upper bearing plate and the upper blind plate, the pressure testing device further comprises a lower blind plate and a lower bearing plate, and a second cover plate is arranged outside the lower blind plate and the lower bearing plate. The device is suitable for the sealing test of a rubber sleeve part and a pipe column connecting buckle, can test the pressure-bearing sealing capability of the rubber sleeve at 35MPa, and can e