Self-filtration device with automatically updated filter layer

The utility model provides self-filtering equipment with an automatic filter layer updating function. The self-filtering equipment comprises a machine body, an unwinding roller, a winding roller, a base, a feeding shaft, a waste gas inlet and a gas outlet, machine body is arranged at one end of base, filter part is arranged in machine body, a waste gas inlet is formed in one end of the filtering part; gas outlet is formed in the other end of the shell, an unwinding roller is arranged on the portion, located on the outer side of the filtering part, of the machine body, a row of guide rollers and a row of opposite feeding shafts are arranged in the machine body, one end of the filtering layer is wound on the unwinding roller, a continuous Z shape covering the filtering part is formed throughthe row of opposite guide rollers and the row of opposite feeding shafts, and the other end of the filtering layer is connected to the winding roller. The filter has the advantages that the filter effect is kept stable and t