Multifunction oil output increasing device

The utility model provides a multifunction oil adding device, which relates to a complete set of device under wells of oil extraction devices. The utility model is formed by coupling a deaerator, a packer, a check valve and a desander through screw thread; wherein, the deaerator is mainly composed of a gas collecting channel, a central tube and a piece of flight, the packer is composed of a leather cup, a steel sleeve and a pressing cap of the leather cup, the check valve is composed of a valve seat and a valve ball, the desander is composed of pipes with thin gap. The beneficial effects of the utility model are in the following aspects: the integral design of the deaerator, the packer, the check valve and the desander makes the utility has the advantages of compact structure, shorter total length, lighter weight, easy mounting in oil well workings and easy operation. The deaerator can dispel gas in the crude oil. The cooperative application of the check valve and the packer can prevent well washing liquid polluting the stratum. The desander can prevent sand from entering into the oil well pump, therefore realizes that one device is provided with a plurality of functions to obtain the aim of increasing of crude production rate in the oil wells.