The invention relates to an environment-friendly wall body material mainly prepared from wood and coal ash. According to the wall body material, national requirements including land saving, energy saving and environmental management are responded; cultivated lands are protected, the energy is saved, the ecological degradation is relieved, and building functions are improved. By replacing attaching bricks and sintered bricks in building materials with building blocks and plates mainly prepared from wood and coal ash, the insufficient throughput of existing novel materials such as baking-free bricks, perforated bricks, hollow building blocks, aerated concrete and the like is solved.