The utility model relates to an automatic interlocking device used between a hydraulic oil pipe wrench operating rod and a safety valve. The utility model provides an automatic interlocking device used between an operating rod and a safety valve of a hydraulic oil pipe wrench, and belongs to the field of hydraulic oil pipe wrenches for oil testing and well repairing tripping operation. Characterized in that it is characterized in that it comprises, the device comprises a first locking device, a reset transmission device and a second locking device, the second locking device is connected with the reset transmission device, when the reset transmission device is located at a first position, the second locking device and the first locking device are locked, and when the reset transmission device is located at a second position, the second locking device and the first locking device are separated and unlocked; the transmission mechanism transmits the position difference and controls the reset transmission device to stretch out and draw back to drive the first locking device and the second locking device to be locked and unlocked, so that the operation rod is locked and controlled when the safety valve is in an open state, and the accident that fingers are pinched is greatly reduced.