Air purifier

The invention relates to an air purifier. The air purifier is characterized by comprising a negative ion generator mounted above an upper cover of a water tank, and a lower cover is arranged at the bottom of the water tank; the water tank comprises a tank body, a tank body connecting ring is arranged on the outer edge of the top end of the tank body, an inner mounting ring is arranged on the innerwall of the top of the tank body, the plane where the inner mounting ring is located is lower than the plane where the tank body connecting ring is located, a bottom plate is arranged on the inner wall of the bottom of the tank body, and a water inlet pipe, a water outlet pipe, an air inlet pipe and an air outlet pipe are arranged on the side wall of the tank body; a positive electrode plate is mounted on the lower cover, a negative electrode plate is mounted on the upper cover, and a transmitting head mounting plate for mounting a negative ion transmitting head is fixedly mounted on the inner mounting ring; and the air inlet pipe is connected with a fan. The air purifier is simple in structure, can solve the problem of a black wall caused by the negative ion generator, and solves the problems that in the prior art, floating dust needs to be clustered to fall and be purified, too large and too small floating dust cannot be purified, and formaldehyde and the like can only be decomposed.