The invention provides a motor heat radiation structure integrated with an invagination type and an inner fin type. The motor heat radiation structure integrated with an invagination type and an inner fin type is characterized in that a stator and a rotor of a motor are a shielding sleeve structure; a stator casing approaches the end portion winding position and is invaginated to the inside of the motor in the circumferential direction, and heat radiation fins are uniformly distributed in the invaginated part of the casing in the circumferential direction; and the outer surface of the motor end cover is invaginated to the inside, and heat radiation fins are uniformly distributed on the invaginated length of the end cover. By increasing the air contact area between the motor casing and the end portion and by enabling sea water or river water to enter the invaginated part of the casing, the motor heat radiation structure integrated with an invagination type and an inner fin type can reduce temperature rise of the end portion winding.