Water quality purifying and filtering device

The invention relates to the technical field of filtering devices, in particular to a water quality purifying and filtering device. The water quality purifying and filtering device comprises a shell and a filtering mechanism, wherein the filtering mechanism comprises a main filtering pipe and an auxiliary filtering cylinder. A first spiral groove and a first spiral protrusion are formed in the peripheral wall of the main filter pipe, a second spiral protrusion and a second spiral groove are formed in the peripheral wall of the auxiliary filter cylinder, and a protruding block is fixedly arranged on the second spiral protrusion. Due to the fact that the impurities are mainly concentrated in the first spiral groove, and the first spiral protrusion is not prone to being blocked by accumulation of the impurities, the filtering service time of the main filtering pipe is prolonged. The auxiliary filter cartridge is rotated, the auxiliary filter cartridge rotates and moves relative to the main filter pipe, and the a