Alternate self-cleaning grid for domestic sewage treatment

The invention relates to the technical field of alternate self-cleaning grid plates, in particular to an alternate self-cleaning grid for domestic sewage treatment. A lower layer grid structure is located below an upper layer grid structure, the upper layer grid structure comprises an upper layer grid, material blocking plates, built-in sliding grooves, reset springs and connecting holes, the material blocking plates are welded and fixed to the two sides of the upper end of the upper-layer grid, the built-in sliding grooves are formed in the middle side of the lower end of the upper layer grid in a penetrating mode, the reset spring is placed on one side of the inner end of the built-in sliding groove, and the connecting hole is formed in one side of the upper end of the upper layer grid. Through the arrangement of the invention, the two grid plates can be arranged in a V shape, so that in the filtering process of the grid plates, large impurities can slide towards the two sides of the grid plates under the s