Waterproof three-phase asynchronous motor

The utility model discloses a waterproof three-phase asynchronous motor which is used for solving the technical problem that the shaft extension of the existing three-phase asynchronous motor has bad waterproof performance. The waterproof three-phase asynchronous motor comprises a base (1), a stator (2), a rotor (3), a motor rotor shaft (4), a front end cover (6) and a rear end cover (5), wherein a bearing outer cover (8) and a bearing inner cover (9) are arranged on two sides of a rotating shaft bearing (16) which is fixedly arranged in the middle of the front end cover (6); the motor rotor shaft (4) is fixedly connected with the inner ring of an annular shaft surface oil seal bracket (10) through a hot sleeve; a shaft surface oil seal (11) is fixedly arranged on the annular shaft surface oil seal bracket (10); a first framework oil seal (13) is arranged on a contact arc surface between the bearing outer cover (8) and the motor rotor shaft (4); and a second framework oil seal (15) is arranged on a contact ar