Multi-stage fine-filtering device

The utility model relates to a multi-stage fine filtering device. The upper end face of the utility model is provided with a water inlet pipe and a water outlet pipe, and the lower end face is provided with a slag discharge hole; a housing is formed from the assembly of three segments of drum, and the drum is divided into a muddy water chamber, a material filtering chamber, and an adsorbing chamber; a spring in the cavity of the muddy water chamber can push the upper end thereof to the lower end face of an upper water stop plate; the absorbing chamber is composed of a central outer pipe and an inner pipe sheathed in the outer pipe; the outer walls of the outer pipe and the inner pipe are both fixed with filter membranes. After the utility model carries out the filtration, the deslagging action can be immediately carried out; moreover, in the utility model, a filter screen inside in the utility model can be automatically flushed in a direct flushing way, and the flushing can be thoroughly carried out. The utility model is mainly used for purifying tap water to enable the tap water to reach the standard of drinking water as well as can be used for the fine filtration and the separation of medical extract.