Coal gangue building block

The invention discloses a coal gangue building block. The coal gangue building block is characterized in that preparation steps are as follows: 1), blending of materials comprising components in percentage by weight as follows: 70%-72% of coal gangue, 12%-14% of carbide slag and 15%-17% of water; 2), smashing; 3), stirring; 4), ageing: well stirred mixed materials are put in a conical steel bin for digestion, and a vibrator is arranged on the wall of the bin; 5), wheel grinding; 6) pressing forming: the forming pressure is 2 MPa, and a two-time pressurizing manner is adopted; 7), standing; and 8), steam curing. The coal gangue building block is safe, reliable and high in practicability and has the effects of reducing environment pollution, saving land and saving energy.