The invention discloses a vertical coal powder corner tube boiler which comprises combustors, a boiler hearth, a high-temperature air pre-heater, an economizer, a low-temperature air pre-heater convection bank, an upper header, a top header, a boiler barrel and a lower header, wherein the lower header is arranged on the bottom of a boiler body, the upper header and the top header are arranged on the top of the boiler body and are communicated through a steam communicating pipe. The vertical coal powder corner tube boiler is characterized in that the combustors are arranged in a V shape, the boiler body is of a vertical corner type membrane type water-cooling wall structure, four descending pipes are arranged in four corners, the descending pipes and two ends of the membrane type water-cooling wall are respectively communicated with the upper header and the lower heater, the convection bank is arranged on the outer side of the membrane type water cooling wall, the top of the convection bank is communicated with a hearth smoke outlet, and the bottom of the convection bank is communicated with the high-temperature air pre-heater. The vertical coal powder corner tube boiler has the advantages of compact integrated structure, simple appearance arrangement, small occupation area, low steel consumption, large water circulation pressure difference, safety and reliability in water circulation, and the like.