The invention provides a biomass incinerator, and belongs to the technical field of bioengineering incineration. The biomass incinerator comprises an incineration shell and a feed device, wherein theincineration shell is a cylindrical body and is vertically placed and is made of ferroalloy materials, and an incineration cavity is formed in the incineration shell; self locking of a feed pipe can occur, a feed box is installed on the upper end of the feed device, the feed box is connected with the feed device by virtue of a screw, a feed tube is arranged on the lower end of the feed box, the lower end of the feed tube is connected with the feed device, an incineration plate is arranged on the lower end of the incineration cavity, the circumference of the incineration plate is fixed to the inner surface of the incineration shell, an ignition device is arranged on the lower end of the incineration plate, the right end of the ignition device passes through the incineration shell, an air inlet pipe is connected to the lower end of the incineration cavity, the other end of the air inlet pipe is connected with air, and a blower is installed on the air inlet pipe. The device has the advantages of simple structural design, convenience in operation, low cost, good crushing effect on biomass, small occupied area, easiness in management and the like.