Oil, gas, water and impurity mixture polyphase separating device

The utility model provides an oil, gas, water and impurity mixture polyphase separating device. The polyphase separating device is provided with a horizontal casing (1); a baffle plate interlayer (2), a micro-filtration integrated film interlayer (3) and an ultrafiltration integrated film interlayer (4) are arranged in the horizontal casing from the front end to the tail end in sequence; and the horizontal casing can be divided into a coarse separation settling cavity (1-1), a first filter cloth liquid cavity (1-2), a second filter cloth liquid cavity (1-3) and an oil-water separation cavity (1-4) through the interlayers. In the utility model, gas-liquid-solid coarse separation is conducted through the methods of mechanical rotational flow separation and baffle plate separation at first, and then oil-water fine separation is conducted by utilizing the integrated films to filter. Since the oil, gas, water and impurity mixture polyphase separating device adopts the integrated film filtration for separation, the