The utility model discloses a bagasse burning boiler and belongs to the technical field of boilers. The bagasse burning boiler comprises a boiler body, the boiler body is provided with a feeding port communicated with a combustion chamber, a fire grate is arranged in the combustion chamber and formed by splicing a plurality of fire grate pieces with through holes, gaps are reserved between the fire grate pieces, the fire grate is inclined, the front of the fire grate is close to the feeding port and is higher than the tail end of the fire grate, a material receiving hopper is arranged below the tail end of the fire grate, the front end of the fire grate is provided with a plurality of nozzles connected with a main air pipe through spray pipes, the nozzles are towards the tail end of the fire grate, at least two sound wave ash removing devices connected with the main air pipe through air pipes are respectively arranged on two sides of the fire grate, the main air pipe is connected with an air storage tank, and the sound wave ash removing devices are connected with a controller through wires. The bagasse burning boiler can solve the problem of boiler explosion caused by blockage of a fire grate hole of the bagasse burning boiler.