Sound insulation device of medium-high speed motor

The utility model provides a sound insulation device of a medium-high speed motor, and belongs to the technical field of medium-high speed motors. The sound insulation device of the medium-high speed motor comprises a shell main body part and a sound insulation and heat dissipation assembly. The housing main body part comprises a base, an outer housing and an end cover, the outer housing covers the motor, the bottom of the outer housing is fixedly connected with the base, and the end cover is arranged at the end part of the outer housing; the sound insulation and heat dissipation assembly comprises a flow guide cover shell, a sound insulation cotton layer and a sound absorption layer, the sound absorption layer, the flow guide cover shell and the sound insulation cotton layer are sequentially arranged on the inner wall of the outer cover shell, and a cavity for water source circulation is formed in the flow guide cover shell. After the motor is subjected to three times of noise reduction treatment, noise poll