The invention discloses a biomass and sludge gasified thermal power boiler. The biomass and sludge gasified thermal power boiler comprises a gasification furnace and a feeding hopper arranged above the gasification furnace, wherein a furnace lid is arranged at the upper part of the gasification furnace, a furnace hearth is arranged inside the gasification furnace, a burned gas outlet is formed in the sidewall of the upper part of the gasification furnace, an igniter and an oxygen feeding blower are arranged at the lower part of the gasification furnace, a steam header is arranged at the upper part of the furnace hearth, the furnace hearth is divided into a plurality of furnace chambers from top to bottom, a furnace hearth gas valve is arranged at the bottom of each furnace chamber, all furnace hearth gas valves are connected with a furnace hearth gas valve controller, a plurality of feeding gas valves are arranged in the feeding hopper from top to bottom, and the feeding gas valves are all connected with a feeding gas valve controller. The biomass and sludge gasified thermal power boiler can achieve continuous operation, is high in energy source utilization ratio and is clean and environment-friendly.