Coupling convenient to replace

The utility model relates to the technical field of couplings, and discloses a coupler convenient to replace, which comprises two connecting sleeves, locking grooves are formed in the connecting sleeves, two counterbores are formed in the two connecting sleeves, the counterbores are communicated with the interiors of the locking grooves, two first threaded holes are formed in the connecting sleeves, and two second threaded holes are formed in the connecting sleeves. According to the coupler convenient to replace, a baffle is pushed to enable a silica gel pad to be elastically deformed in the process that the silica gel pad extrudes the outer surface of the connecting sleeve, and the silica gel pad is prevented from being loosened; furthermore, the silica gel pad is extruded to enter the counterbore to extrude the hexagon bolt and the fixing bolt, so that the hexagon bolt and the fixing bolt are prevented from loosening and are also prevented from being separated from the connecting sleeve, the stability and s