Pin shaft curvature detection device

The invention belongs to the technical field of measurement, and particularly relates to a pin shaft curvature detection device. The device comprises a lower bottom plate, and the top of the lower bottom plate is sequentially provided with spring fixing bases, a front fixing plate and a rear fixing plate from the head end to the tail end; a dial indicator is arranged on the rear fixing plate, linear sliding rails are arranged between the front fixing plate and the rear fixing plate, sliding blocks are slidably arranged on the linear sliding rails, and a front-back moving block is arranged at the tops of the sliding blocks; a pin shaft heightening block is arranged between the front-back moving block and the front fixing plate, the pin shaft heightening block is in one-to-one correspondenceto the size of a to-be-measured pin shaft, the distance between the head end and the tail end of the pin shaft heightening block is d, the normal diameter of the to-be-measured pin shaft is recordedas h, and d is larger than