The invention belongs to the technical field of energy-saving building materials and in particular relates to heat-insulation bricks produced by utilizing waste bricks and pond sludge. The heat-insulation bricks are prepared from the following production raw materials: waste bricks grains, the pond sludge, bentonite tailings, fly ash, expanded perlite, attapulgite clay, calcium sulfate, talcum powder, montmorillonite tailings, shale powder, a foaming agent and water. The brick bodies are prepared from the following production steps: (1) molding brick blanks; (2) airing and curing; (3) firing and molding. The firing and molding process is carried out in a tunnel kiln and pre-heating of the tunnel kiln also can be used for drying the pond sludge to obtain needed production raw materials. Theheat-insulation bricks provided by the invention have the advantages of relatively good heat transfer coefficient, weathering-resisting performance and anti-freezing performance and the density of the brick bodies is relatively low. Furthermore, the heat-insulation bricks take recyclable solid-state garbage as the production raw material, so that the production cost is relatively low and the heat-insulation bricks have relatively high economic value and environment-friendly value.