Oil-gas separator

The utility model discloses an oil-gas separator, belongs to the technical field of oil-gas separation, and solves the problem of low separation efficiency of the existing oil-gas separator. The oil-gas separator comprises an upper cylinder and a lower cylinder, the upper cylinder is a hollow cylinder, the lower cylinder is a hollow cone, a cavity of the upper cylinder is communicated with a cavity of the lower cylinder, an exhaust pipe communicated with the upper cylinder is arranged at the top of the upper cylinder, a gas inlet pipe communicated with the upper cylinder is arranged on the side face of the upper cylinder, and a gas outlet pipe communicated with the gas inlet pipe is arranged on the side face of the lower cylinder. A flow guide plate enabling oil mist to enter a cavity of the upper barrel in the tangential direction is arranged at the joint of the air inlet pipe and the upper barrel, filter cotton is arranged on the inner wall of the upper barrel, a guide barrel extending along one end of the