The invention discloses an oil-gas separator for prying, and belongs to the technical field of oil and gas field equipment. The oil-gas separator comprises a tank body, a partition plate is arranged in the tank body and divides an inner cavity of the tank body into a precipitation cavity and an oil storage cavity, and the upper portion of the precipitation cavity is communicated with the upper portion of the oil storage cavity; a buffering pipe is vertically installed on the tank body and penetrates through the precipitation cavity, the upper end of the buffering pipe is blocked and rotationally provided with a transmission shaft, an impeller is installed on the portion, located in the buffering pipe, of the transmission shaft, a feed port is formed in the portion, located at the outer side of the tank body, of the buffering pipe and faces the impeller, and a discharge port is formed in the portion, located at the inner side of the tank body, of the buffering pipe. The oil-gas separator is good in energy-saving effect and widely applied to separation of solid-liquid-gas-phase mixtures and improves oil-gas separation efficiency.