The invention discloses an energy-saving and environment-friendly boiler for a thermal power plant. The energy-saving and environment-friendly boiler comprises a coal inlet, a coal inlet pipe, an airblower, an air blowing pipe, a coal mill, a powder discharging machine, a powder blowing pipe, a powder discharging pipe, a multi-head coal powder outlet, a boiler wall, an evaporating chamber, a drumboiler, a steam pipeline, a superheater, a water inlet pipeline, an economizer, an air pre-heater, an air inlet pipe, an air supply port, an air supply fan, a waste gas pipeline, a dust remover, a desulfuration chamber, a nitrogen removing chamber, a waste gas turbine, a chimney, a slag blowing port, a slag discharging port and a deslagging trough. The coal inlet is connected with the coal inletpipe, the coal inlet pipe is connected with the coal mill, the lower portion of the coal mill is connected with the air blowing pipe, the air blowing pipe is connected with the air blower, the powderblowing pipe is connected to the position, relative to the air blowing pipe, of the coal mill, the powder blowing pipe is connected with the powder discharging machine, and the powder discharging machine is connected with the powder discharging pipe. By adopting the energy-saving and environment-friendly boiler, high temperature waste gas is recycled repeatedly, the temperatures of inflow water and inflow air are increased while the temperature of the waste gas is decreased to a largest extent, energy is saved, dust removing, desulfuration and nitrogen removing treatment are conducted on the waste gas at the same time, and the degree of waste gas pollution is reduced.