The invention discloses a screw pump for oil extraction. The screw pump for oil extraction comprises a stator shell body and a rubber layer, wherein the inner surface of the stator shell body is sunken towards the direction of the outer sidewall of the stator shell body to form a plurality of grooves; and the rubber layer is annularly bonded onto the inner surface of the stator shell body. According to the screw pump for oil extraction, the bonding strength between rubber and the stator shell body is increased, the capacity of resisting to transversal and circumferential shear force between the rubber and the stator shell body is improved, and the service life of the screw pump is prolonged.