Overload protection device for electric winching machine

The utility model provides an overload protection device for an electric winching machine, which comprises a winching machine main body and is characterized in that a supporting roller is extruded by a traction piece on the winching machine main body, so that the supporting roller moves downwards, and when the supporting roller moves to the bottom of a first descending groove, the supporting roller can descend to the bottom of the first descending groove. When the winching machine works, a baffle does not limit a pull rod any more, then a pull spring drives the pull rod to extrude a supporting roller, the supporting roller enters a second descending groove, the supporting roller can make contact with a trigger switch, the trigger switch controls the winching machine body not to run any more, and meanwhile the supporting roller is not subjected to pushing force any more; therefore, the traction piece on the winching machine main body can be in a loose state, the problem that the winching machine main body is c