Shaft seal of internal mixer

The utility model discloses a shaft seal of an internal mixer, which comprises a gland cover (6), wherein a flange is formed at the lower end of the gland cover (6); mounting openings are uniformly formed on the end face of the flange; the gland cover (6) consists of a left part and a right part; a ring slot is formed on the inner wall of the gland cover (6); a sealing ring (5) is installed in the ring slot; a position in the radial direction of the sealing ring (5) is cut off so that an internal mixer cylinder piston rod (2) can be sleeved via the lateral surface; a ring slot is formed on the upper end face of the gland cover (6); and an O-shaped sealing ring (9) is installed in the ring slot. The shaft seal of the internal mixer is simple in structure, specially designed and convenient to install, has long sealing time and good sealing effect, ensures the oil seal to have longer service life, and simultaneously is convenient to maintain and convenient to operate by the workers.