The embodiment of the invention discloses a backward skating prevention device for a winch skip. The backward skating prevention device comprises a speed measurement motor, a main motor steering judgment device, an isolating switch and a programmable controller, wherein the speed measurement motor is connected to the tail part of a main motor of the winch skip, rotates synchronously with the main motor and is used for outputting a voltage signal; the input end of the main motor steering judgment device is connected with the output end of the speed measurement motor and used for judging steering of the main motor according to the voltage signal output by the speed measurement motor; the isolating switch is connected in series with a winch skip control loop; the input end of the programmable controller is connected with the main motor steering judgment device, the output end of the programmable controller is connected with a controller of the winch skip and the isolating switch respectively, and the programmable controller is used for sending a start signal indicating that the main motor rotates in a first direction to the winch skip and receiving the steering signal sent by the main motor steering judgment device, and when the steering signal sent by the main motor steering judgment device indicates that the main motor rotates in a direction opposite to the first direction, the isolating switch is turned off. The backward skating prevention device can accurately detect the backward skating fault of the winch skip and can stop the winch skip in case of backward skating to prevent severe equipment accidents.