Faucet water purifier capable of discharging sewage and detaching and cleaning filter element

The utility model belongs to the field of faucet water purifiers, and particularly relates to a faucet water purifier capable of discharging sewage, detaching and cleaning a filter element, which comprises a faucet body, an upper shell is movably connected to the front part of the outer surface of the faucet body in a penetrating manner, a sealing pipe is fixedly connected to the upper end of the upper shell, and a fastening device is movably connected to the outer surface of the sealing pipe. The upper end of the sealing pipe is fixedly connected with a clamping device, the lower end of the upper shell is in threaded connection with a lower shell, and the lower end of the lower shell is in threaded connection with a pollution discharge screw rod; a groove is formed in the upper shell, the groove is of a structure with a narrow upper part and a wide lower part, a filter screen is movably connected in the groove, the diameter of the filter screen is smaller than that of the lower inner wall of the groove, and