The invention provides a multivariable optimization method and structure for the asynchronous motor efficiency. According to the multivariable optimization method and structure for the asynchronous motor efficiency, by optimizing the silicon steel sheet thickness and the notch width, the efficiency of an industrial three-phase asynchronous motor can be better improved, the weakness that the wire diameter can not be increased to improve the efficiency due to the groove filling rate limitation can be avoided, and the problem of vibration noise caused by chute changing can be solved; meanwhile, the target optimization of a multivariable function is performed by applying an advanced optimization algorithm and computer resources, and therefore the motor efficiency can be correspondingly improved.