The invention provides a trace paying-out gear applicable to an underwater anchoring platform. After a depth fixing process is completed, by the operation of the device, a cable barrel continuously releases a trace cable system, and the abrasion position of the cable system and a cable guide wheel migrates constantly, so as to effectively reduce the risk of fracture of the cable system. The tracepaying-off gear comprises a multi-stage drive gear set, a tail-stage speed-stabilized wheel set and an escapement regulation mechanism. The multi-stage drive gear set transfers tension of the cable system to the escapement regulation mechanism, and the continuous trace release of the mooring cable system is realized by the oscillation frequency of the escapement regulation mechanism and the transmission ratio of the wheel system, so as to force the abrasion position of the mooring cable system and a cable guide wheel is continuously changed. The trace paying-off gear can effectively avoid fracture of the cable system caused by mutual abrasion of the cable system with the cable guide wheel, so as to be favorable for extending the service duration of the underwater anchoring platform.