The invention discloses a filter device for self-overflowing dissolving agent sewage treatment, belonging to the technical field of sewage treatment, which can realize the introduction of sewage through the left end of the filter treatment pipe, and can filter the dissolving agent in the sewage through the setting of a non-return component. The particles play a non-return function, combined with the filtering effect of the filter screen, so that the dissolving agent particles in the sewage are intercepted between the non-return plate and the filter screen, and fall into the collection recovery pipe through the guide hopper. The setting of the material recovery component, the positive rotation of the adjustment rod can drive the movable pipe plug, movable bucket plug, and movable hole plug to move downward, so that the solvent particles in the aggregate recovery pipe can be dropped without stopping the sewage treatment. Put it into the spherical filter material net, then reverse the adjustment lever to reset, then the filtered dissolving agent particles can be taken out through the discharge hole and recovered, so that the dissolving agent particles can be easily taken out and recycled, and the sewage treatment efficiency can be improved. Significantly improved usability.