Oil layer respirator

The invention provides an oil layer respirator capable of increasing yield of an oil well through a multiple composite mode. An upper joint is connected with a damping chamber outer pipe, a damping spring seat, a closed chamber outer pipe, a damping sliding body, a lower liquid passing board and a lower joint. An upper liquid passing board is connected with a sealing plunger, a valve body seat and a stop sliding body. The valve seat is provided with a valve body, a damping spring is mounted between the damping chamber outer pipe and the sealing plunger, and an elastic rubber cylinder between a limiting sliding body and the damping sliding body. When the pressure on the valve body raises, the elastic rubber cylinder and an oil layer sleeve are sealed and the elastic rubber cylinder move downwards to impact and pressure the oil layer. When the pressure on the valve body reduces, the elastic rubber cylinder can move upwards to suck and reduce pressure of the oil layer. A pulsation breathing effect can repeatedly affect on the oil layer to raise the yield of an oil well. The oil layer respirator can work under the well for a long time with no external factors, so the oil layer respirator is energy saving, environmental friendly, safe and high in efficiency.