The invention discloses an inspection method for the air gap between a stator and a rotor of a permanent magnet motor. A special inspection tool for the air gap between the stator and the rotor and a technological end cover are adopted for inspecting the air gap between the stator and the rotor of the motor. The special inspection tool is composed of a special filler gauge and a handle; the filler gauge changes little in thickness along with the temperature and is resistant to abrasion and corrosion, and the filler gauge is made of stainless steel and will not be attracted by the magnetism of the permanent magnet motor; the handle should have a certain height so that the operation of inspecting the air gap can be conveniently carried out. The technological end cover is manufactured according to the dimensional precision of an end cover of the motor and will not influence the assembly quality of the motor, and the technological end cover is provided with a through hole so that the special inspection tool can enter the motor conveniently to carry out inspection. The inspection method is low in system cost and easy and convenient to implement; by means of the inspection method, the assembly quality of the motor can be quickly inspected, and whether the length of the air gap between the stator and the rotor of the motor meets the requirement can be quickly verified.