Filtering device for washing iron powder removal during pretreatment of coating process

The utility model discloses a filtering device for washing iron powder removal during the pretreatment of a coating process. The device comprises a water inlet pipe and an auxiliary water tank, wherein a water outlet of the water inlet pipe is connected with a water inlet of the auxiliary water tank, skew plate grooves are formed in the auxiliary water tank, and skew plates are arranged in the skew plate grooves. The device further comprises an overflow water tank and a filter water tank, wherein a water inlet of the overflow water tank is connected with a water outlet of the auxiliary water tank, water overflow pipes are connected to the bottom of the overflow water tank, overflow water filtering meshes are arranged below the water overflow pipes and are connected with a water inlet of the filter water tank, an iron powder adsorption device is arranged in the filter water tank, and a water outlet of the filter water tank is connected with a water draining pipe. The overflow water tank, the water overflow pip