The invention discloses an insulation structure for motor stator coils. The insulation structure comprises turn-to-turn insulators, a ground insulator and an anti-halo layer or a protective layer, wherein the turn-to-turn insulators are packed on copper strap wires; the ground insulator is packed on the outer sides of the turn-to-turn insulators of all the copper strap wires; and the anti-halo layer or the protective layer is packed outside the ground insulator. The insulation structure for motor stator coils reduces the unilateral thickness of a main insulator of the stator coil so as to reduce the size of a motor and save materials, so that the utilization ratio of the slots and the power of the motor are improved, and in addition, the insulating property of the motor and technical-economic index are improved remarkably, according to the invention.