The invention relates to an intra-motor over-current heat exchanging simulation testing apparatus. The simulation testing apparatus can fully simulate heating and heat exchanging of an iron core of a motor, and safeguards accurate simulation for testing over-current slotted vanes of all kinds of new structures or heat exchanging coefficients of the stator iron core. Testing data can directly reflect the cooling effects of an innovative structure, play a decisive role in determining whether to adopt a new structure of a key part, and can provide accurate testing data in conducting temperature rising calculation. The simulation testing apparatus can serve as a detection device for evaluating the innovative structure of the motor, and has important significance in innovation work like strengthening the cooling effects of the motor and increasing motor cooling technology.