Lifting anti-falling protection device for derrick of petroleum drilling machine

The utility model discloses a lifting anti-drop protection device for a derrick of a petroleum drilling machine, which comprises a fixing frame and a lifting frame, a buffer blocking structure is arranged at the upper end of the fixing frame, the lifting frame is arranged in the fixing frame in a sliding manner, and the upper end of the lifting frame penetrates through the buffer blocking structure through a steel wire rope to be connected with a winch. When the lifting frame ascends to the top of the fixing frame, the upper end of the lifting frame firstly makes contact with the buffering blocking structure, and through the buffering effect of the buffering blocking structure, the impact effect of the sliding frame on the limiting check block is effectively reduced; meanwhile, the contact sensor is triggered at the moment of contact, the contact sensor sends an electric signal to the controller, and the controller synchronously controls the telescopic brake structure to pop up, so that the lifting frame is b