Pressure balance structure of submersible motor for water filling type well

The utility model discloses a pressure balancing structure of a water-filled well submersible motor, which comprises a motor body, and a pressure regulating bag and a one-way pressure release valve are respectively arranged at the bottom and the top of the motor body; the motor body comprises an upper cover, a shell and a base which are sequentially arranged from top to bottom; a thrust bearing bracket is arranged in the base, and the opening part of the pressure regulating bag is sleeved on the thrust bearing bracket; and the pressure regulating bag is integrally pressed into the inner cavity of the base. When the motor body dives into deep water, the external water pressure of the motor body is larger than the internal pressure, internal components and residual air of the motor body are compressed, and the pressure regulating bag contracts inwards to balance the internal pressure and the external pressure; when the motor body works underwater, the interior of the motor body can generate heat to cause volume