Single-screw type refrigerating compressor capable of independently cooling motor

The invention discloses a single-screw type refrigerating compressor capable of independently cooling a motor. The single-screw type refrigerating compressor comprises a motor side and a compression side which are relatively sealed, wherein a motor stator is fixedly arranged in a motor side housing, and the outer wall of the motor stator is in tightly fit with the inner wall of the housing; a first refrigerant runner is arranged on a position, which corresponds to the outer wall of the stator, on the inner wall of the motor side housing; the first refrigerant runner horizontally and spirally surrounds the outer wall of the stator; the motor stator sleeves a motor main shaft; a second refrigerant runner is formed in the length direction inside the main shaft; an inlet of the second refrigerant runner is formed in the rear end of the main shaft; a plurality of outlets of the second refrigerant runner are formed in the radial direction of the main shaft and communicate with the side wall of the main shaft; the front end and the rear end of the stator are separately extended with stator end part windings; the stator end part windings are arranged between the inner wall of the motor side housing and the main shaft in a clearance mode; two refrigerant injection orifices are separately formed corresponding to the front and rear ends of the stator end part windings; and a refrigerant concentrated outlet is formed in the motor side housing. The single-screw type refrigerating compressor realizes independent cooling of the motor portion, and each part of the motor can be internally and externally cooled in an all-around mode.