Water pick with magnetic suction water tank

The oral irrigator comprises the water tank and a shell, the water tank is provided with a cavity with the diameter gradually expanded from top to bottom, the cavity is used for containing liquid, an opening is formed in the upper wall of the cavity and is in a non-circular shape, a supporting wall is formed on the periphery of the opening, and the magnetic suction water tank is arranged on the supporting wall. The shell is provided with a supporting wall, the supporting wall is provided with first magnetic parts which are distributed annularly, the lower wall of the shell extends downwards to form a sealing wall matched with the opening in size, the sealing wall can be attached to the inner wall of the opening, the lower wall of the shell is further provided with a positioning wall attached to the supporting wall, and the positioning wall is provided with second magnetic parts matched with the first magnetic parts. In actual use, the sealing wall of the shell is inserted into the opening, the water tank and