Pipe type oil well pump

The utility model relates to a pipe type oil well pump. The pipe type oil well pump comprises pump lower joint, a fixed valve connected to the lower portion of the pump lower joint, a pump cylinder fixed above the lower pump connector through threads in a sealed and screwed mode, an oil pipe connected to the upper portion of the pump cylinder, a piston installed in the pump cylinder in a sliding and sleeved mode, movable valves arranged inside the piston and a sliding sleeve arranged in the pump lower joint in a sliding and sleeving mode. When an oil pumping rod is broken, the piston moves downwards under the effect of gravity and presses the sliding sleeve to slide downwards, at the moment, a spring is compressed, a pump oil drain hole is opened, a piston oil drain hole is communicated with the pump oil drain hole and oil and water are discharged from the piston oil drain hole and the pump oil drain hole in sequence; the problem that when an original well oil pipe is lifted, oil and water overflow onto the ground because in a traditional pump lower collision type pin oil drain device, when an oil pumping rod is broken, the oil pumping rod and a piston fall into a pump, a collision hole is blocked accordingly and rod-drop oil drain cannot be conducted is avoided; the pollutant emission load and the sewage disposal workload are reduced.