To obtain a building ecological mixture using organic waste and inorganic waste as one component in a state wherein high hardness metals are removed.

A waste removing method comprises a process of carrying waste by a carrying device, a process of separating the waste into reusable waste and hard metals from unreusable waste, a process of removing the reusable waste and hard metals, a process of feeding the unreusable waste into a crushing device, a process of mixing another composite matter with crushed waste and a process of forming building elements. Also, the ecological mixture contains approximately 5% to approximately 50% cement, 0% to approximately 40% sand, 0% to 40% gravel, approximately 30% to 95% crushed waste and water required for manufacturing a building ecological mixture.