Axial displacement compensation device and universal coupling

The invention discloses an axial displacement compensation device and a universal coupling, and belongs to the technical field of couplings, the axial displacement compensation device comprises a power input shaft, a power output shaft and a power output shaft, the rolling sets are distributed in the extension direction of the central axis, each rolling set comprises a plurality of rolling pieces, the rolling pieces are distributed in the circumferential direction, and the rolling pieces are rotationally connected with the power input shaft; the sliding sleeves are arranged on the power input shaft in a sleeving mode, a plurality of guide grooves are formed in the sliding sleeves in the circumferential direction, the guide grooves extend in the extension direction of the central axis, and the rolling pieces are arranged in the guide grooves in a rolling mode; the power output part is connected with the sliding sleeves so as to output power transmitted by the sliding sleeves. The sliding sleeve, the rolling se