The utility model provides a special high -pressure water injection check valve in oil field, includes, valve body, ball seat and spheroid, and its characterized in that: the inside of gland is placed in to the pressure release valve core, and with gland threaded connection, placed the ball seat at the interior middle part of valve body, the inside of ball seat is placed in to the spheroid, and with ball seat sealing contact, behind gland and the valve body threaded connection, with the ball seat crimping formula cooperation of lower part, be equipped with in one side of gland and be used for the spacing jackscrew of apical grafting pressure release valve core, be provided with in the lower part of pressure release valve core and put the pressure passageway, be equipped with to put on the pressure release valve core and press the hole. The beneficial effects of the utility model are that: 1. Simple structure, that the installation is maintained is convenient, with low costs, 2. But putting the pressure equipment from the area puts the safe operation, 3. Go into water outlet mode water injection on water under adopting, ball seat, ball sealing are reliable, long service life, 4. Non -maintaining, it is convenient, swift that the ball seat is changed, and the maintenance cost is low, 5. This check valve adopts clamp or flange and water injection pipeline connection, and installation and dismantlement are convenient.