Abstract: The invention relates to crude oil production, and can be suitably used for hydroprotection of submersible electric centrifugal motors. A hydroprotection protector of a borehole pump electric motor comprises at least one stage, which stage includes a cylindrical body (7), a tube (8) coaxially positioned inside said body and surrounding a shaft (5), nipples (9, 10), a damping bushing (11), an end-face seal (12) and an annular piston (13), which piston is adapted to reciprocate in an annular chamber (14), which chamber is defined within the space between the cylindrical body (7) and the tube (8). The piston (13) separates the chamber (14) into two areas (15, 16) filled, respectively, with the dielectric fluid and the formation fluid arriving from the annulus.