Ecological environment-friendly circulating system

The utility model discloses an ecological environment-friendly circulating system. Biogas digester, a box body is arranged on the upper side of the biogas digester; the lower end of the box is fixedlyconnected with the biogas digester; a crushing mechanism is arranged in the box body; a first feeding hole is formed in the upper end of the box body; a first feeding pipe is fixedly connected into the first feeding hole; a sealing cylinder is horizontally arranged on one side of the box body; one end of the sealing cylinder is fixedly connected and communicated with the box body; the conveying mechanism is in transmission connection with the crushing mechanism, a second feeding pipe is arranged on the upper side of the end, away from the box body, of the sealing cylinder, the second feedingpipe is fixedly connected with the sealing cylinder, a liquid discharging mechanism is arranged in the sealing cylinder, an opening communicating with the biogas digester is formed in the lower end face of the box body, and a