Circulating exhaust type oil well pump for oil field

The invention relates to the technical field of oil well pumps, in particular to a circulating exhaust type oil well pump for an oil field. A circulating exhaust type oil well pump for an oil field comprises a pump cylinder, a plunger is connected to the upper side in the pump cylinder in a sliding mode, a sucker rod is fixedly connected to the upper side of the plunger, a fixing base is fixedly connected to the lower side in the pump cylinder, the portion, located on the plunger and the fixing base, in the pump cylinder is provided with an oil storage cavity, the plunger is provided with a first vertical hole, and the plunger is provided with a second vertical hole. A first vertical hole is formed in the fixed seat, a traveling valve is arranged in the first vertical hole, a second vertical hole is formed in the fixed seat, a fixed valve is arranged in the second vertical hole, and pressure building holes which are symmetrically distributed are formed in the plunger. After the upstroke is finished, the trave