The invention provides a stator case, a stator assembly, a motor and an air-conditioning device, relates to the technical field of motor equipment, and solves the technical problem of poor heat dissipation function of stator cases in the prior art. The stator case comprises a controller accommodating cavity and a stator accommodating area, wherein the controller accommodating cavity and the statoraccommodating area are separated into two independent spaces by a middle partition, so that the PCB board of the controller and the stator are respectively and independently mounted to the controlleraccommodating cavity and the stator accommodating area. The stator case provided by the invention avoids the problem that the PCB of the controller and the stator of the motor affect the heat dissipation during operation due to the too close distance, and is beneficial to the respective heat dissipation of the stator of the motor and the PCB of the controller, thereby improving the performance ofthe motor.