The invention relates to the technical field of oil and gas pipeline spray repairing, in particular to a powder booth regulating device. The device comprises a feeding mounting base, a powder booth and a first radial regulating mechanism. The feeding mounting base comprises a fixed block, a powder booth connecting plate, an air cylinder connecting plate, an air cylinder, a first polish rod, a first bearing and a first regulating clip, the fixed block is fixed to the air cylinder connecting plate, a cylinder barrel of the air cylinder is fixed to the air cylinder connecting plate, and one end of a piston rod of the air cylinder is fixed to the powder booth connecting plate; the powder booth is fixed to the powder booth connecting plate, the first bearing is fixed to one side, where the cylinder barrel of the air cylinder is located, of the air cylinder connecting plate, the first polish rod penetrates through the first bearing, and the first end of the first polish rod is fixed to the powder booth connecting plate; and the first regulating clip is arranged at the second end of the first polish rod, the first radial regulating mechanism is arranged on the position, between the first bearing and the first regulating clip, of the first polish rod in a sleeving mode, and the first radial regulating mechanism comprises a first regulating nut and a first regulating thread sleeve. The powder booth regulating device improves the spraying accuracy.