Sea water desalination device is with switching a jar with step

The utility model discloses a sea water desalination device is with switching a jar with step, including tubulose switching jar cylinder body, cylinder liner, the mouth of pipe and outlet, the cylinder liner cover is equipped with the mouth of pipe and an outlet inside locating the cylinder body on the cylinder body, and the cylinder body is equipped with the water inlet, is equipped with the piston in the cylinder liner, and the cover is equipped with the sealing ring on the piston, and reciprocating motion is by the power device drive to the piston in the cylinder liner, prop up a mouth of pipe and lie in between water inlet and the outlet, the round annular region that the mouth of pipe lies in the part place of cylinder body is equipped with the recess, and grooved ring is around the setting of cylinder body inner wall circumference, the position that the cylinder liner corresponds the recess is equipped with the intercommunicating pore, the inside and recess of intercommunicatingpore intercommunication c