The utility model provides a foldable filter screen and a filter module, and belongs to the technical field of filter equipment. The folding connecting pieces are located between the two corresponding adjacent filter screen main bodies, and the folding connecting pieces are fixed to the side edges of the two adjacent filter screen main bodies, so that the two adjacent filter screen main bodies are connected with each other; the folding connecting piece is made of a flexible material, so that the relative angle change between two adjacent filter screen main bodies can be realized through the deformation of the folding connecting piece, and the folding or unfolding action of the filter screen main bodies is completed; the folding filter screen has the advantages that by adopting the folding connecting pieces made of flexible materials, the angles of the adjacent filter screen main bodies can be freely changed, so that the whole filter screen has excellent folding performance, space is conveniently saved during transportation and storage, and meanwhile, the folding filter screen can be quickly unfolded and kept in a stable structural form during use.