Disclosed is a gas-liquid separator for MVR, comprising a case (1), wherein a cabinet door (2) is disposed on the right side of the bottom of the case (1); a gas-liquid inlet pipe (3) is disposed on the left side of the bottom of the case (1); and a grid plate (6) is disposed in the center of an inner cavity of the case (1). Erosion of the surface of a rotor blade (11), a fixing frame (15) and a spindle (12) can be prevented by means of an epoxy coating disposed on the surface of the rotor blade (11), the fixing frame (15) and the shaft (12), thereby prolonging the service life of the rotor blade (11), the fixing frame (15) and the shaft (12), and saving on the production costs. Bubbles can be pierced by means of a barb disposed on an inner cavity of a spiral tube (9), thus leading to a final gas-liquid separation of gas and liquid flowing out from a separation chamber (16), so that the work efficiency of the device is increased. Vapor can be prevented from overflowing by means of a sealing ring disposed between the case (1) and the cabinet door (2), and the cabinet door (2) can be opened when in a non-operating state, thereby facilitating the examination and repair of instruments inside the device. The device uses a variety of separation methods, thus increasing the work efficiency thereof.