Boiler with inclined fixed fire grate

The utility model relates to the field of boilers. The utility model relates to a boiler, in particular to a boiler with an inclined fixed fire grate. The interior of the furnace body is divided intoa combustion chamber and a heat exchange chamber; an overheating opening is formed in the upper end of the partition plate; an inclined fixed fire grate is arranged in the lower end of the combustionchamber; a feeding device parallel to the inclined fixed fire grate is arranged on one side of the lower end of the combustion chamber; the upper end of the inclined fixed fire grate is connected withthe output end of the feeding device, the inclination angle alpha of the inclined fixed fire grate ranges from 6 degrees to 18 degrees, a lower oxygen distribution opening is formed in the lower endof the combustion chamber, an ignition door and a middle oxygen distribution opening are formed in the middle of the combustion chamber, and an upper oxygen distribution opening is formed in the upperportion of the combustion ch