The invention relates to the technical field of spraying auxiliary devices, in particular to a rotary spraying device; and the rotary spraying device can comprehensively spray workpieces without fixing the workpieces again to improve the use reliability, needs no manual spraying to save the manpower, and can guarantee the workpiece spraying uniformity to improve the practicability. The rotary spraying device comprises a worktable, a turntable, a first motor, a speed reducer, a support plate, a paint box, a spraying pipe, an air compressor, a mounting plate, a second motor, seven sets of firstrotating shafts, eight sets of fixed discs, a transmission shaft and seven sets of first ball bearings; annular through holes, communicating up and down, are formed in the worktable; and eight sets ofthrough holes, communicating up and down, are formed in the turntable by equal angles. The rotary spraying device further comprises a second rotating shaft, seven sets of driven belt wheels, a driving belt wheel, a fixing device, a left thread pipe, a left thread rod, a right thread pipe, a right thread rod, a left adjusting block, a right adjusting block, two sets of adjusting bolts, a left ballbearing, a right ball bearing, a spraying gun and a switch valve.