Abstract: A stator core cooling structure and a motor cooling system are provided. The stator core cooling structure includes a stator core and a motor housing. Axial grooves are distributed on an outer circumference of the stator core and/or an inner circumference of the motor housing, with the axial grooves extending in an axial direction of the stator core and/or the motor housing. The stator core is assembled in the motor housing, and cooling liquid passages are disposed between the stator core and the motor housing by the axial grooves, so that the cooling liquid cools the stator core via the cooling liquid passages.