PROBLEM TO BE SOLVED: To provide a knapsack power spraying machine that can improve work performance when handling a link rod.SOLUTION: A knapsack power spraying machine 100 includes: a spraying machine body 8 having a dusting powder tank 7, a blower 6 and a shutter case 10a provided therebetween； a knapsack frame 1 mounted to the spraying machine body 8, and carried on the back of a worker； a shutter arm 16 disposed in a space S between the knapsack frame 1 and the spraying machine body 8, and coupled to a first valve stem 11a and a second valve stem 12a projected from the shutter case 10a； a link rod 30 vertically extended in the space S and having a lower end coupled to a control lever 21 operated by the worker, and with a tip 34a of an upper end 34 locked to the shutter arm 16； and a handle part 41 provided on the link rod 30 and laterally extended in the space S.
