Automatic take-up and pay-off mechanism for tail rope of motorized winch

The invention discloses an automatic take-up and pay-off mechanism for a tail rope of a motorized winch. The automatic take-up and pay-off mechanism comprises a rack; a fixed angle transmission box and a clamping fixing block are arranged on the rack in a spaced manner; a machine base is arranged in the middle of the portion, between the fixed angle transmission box and the clamping fixing block, of the rack, a rotation angle transmission box is rotationally arranged on the machine base, and a spring is arranged between the rotation angle transmission box and the clamping fixing block; rope clamping wheels are arranged on output shafts on the same side of the fixed angle transmission box and the rotation angle transmission box; a transmission device is in transmission connection with a power input shaft of the fixed angle transmission box and a power input shaft of the rotation angle transmission box so as to drive the rope clamping wheels of the fixed angle transmission box and the rotation angle transmissio