The invention discloses an environmentally friendly brick, which comprises a hollow brick as a brick shell and a cement foam material filled in the cavity of the brick body. The hollow brick includes the following raw materials: cement, shale ore, fly ash, tailing sand, Kaolin; the cement foaming material includes the following raw materials: cement, calcium silicate, calcium sulfate, bentonite, magnesium borate, corn straw powder, AR glass fiber, carbon fiber, water reducer, foaming agent, foaming regulator agent, catalyst, crosslinking agent, foam stabilizer, glyoxal, water. The environmental protection brick of the present invention has the advantages of excellent thermal insulation, sound insulation effect, light weight and pressure resistance, etc.; the method for preparing the environmental protection brick does not require autoclave curing, small investment in equipment, simple process, easy operation, easy promotion, and production The product quality is stable.