The invention relates to the technical field of low-nitrogen combustors, and particularly discloses a low-nitrogen combustor with combustion-supporting air. The low-nitrogen combustor comprises a baseand a movable base, wherein an inner groove is formed in the lower end of an inner cavity of the base; sliding grooves are formed in the left end and the right end of an inner cavity of the inner groove; the left end and the right end of the inner cavity of the inner groove are movably connected with bidirectional threaded rods through bearings; the outer surfaces of the front ends and the rear ends of the bidirectional threaded rods are in threaded connection with movable sleeves; sliding blocks are fixedly connected to the middle ends of the outer sides of the movable sleeves; the sliding blocks slide on the inner surfaces of the sliding grooves; L-shaped fixing blocks are fixedly connected to the middle ends of the inner sides of the movable sleeves; and rotating wheels are fixedly connected to the front sides of the bidirectional threaded rods. According to the low-nitrogen combustor, through the action of the rotating wheels, the L-shaped fixing blocks, the bidirectional threadedrods, rotating rods, the movable sleeves and groove holes, the problems that an existing combustor is inconvenient to assemble and disassemble, the use requirements of people cannot be met, and the development and popularization of the existing combustor are limited are solved.