The invention relates to a knapsack-type tea plucking machine and belongs to the technical field of agricultural and forestal machineries. The knapsack-type tea plucking machine comprises a stationary cutter, a movable cutter, a material dropping machine and an exhaust fan, wherein the material dropping machine is arranged on a knapsack rack, and the exhaust fan is arranged on the knapsack rack and driven by a power plant; the material dropping machine is a closed tank, the center of the top of the closed tank is provided with an air outlet, and the upper part of the closed tank is tangentially provided with an air inlet, the air outlet is communicated with the air intake of the exhaust fan by an air hose with a filter screen, and the air inlet is communicated with a cutting head by a collection tube with a hose node; the cutting head is provided with a V-shaped opening, and the stationary cutter is arranged on one side of the V-shaped opening; the movable cutter which can rotate pneumatically is arranged in the cutting head; and when the movable cutter rotates, a cut edge on the V-shaped opening is formed by the movable cutter and the stationary cutter. In the invention, while the cutters are driven to carry out cut, the collection and conveying as well as follow-up separation of plucked tea leaves are completed naturally, therefore, the knapsack-type tea plucking machine is clever; and after the knapsack-type tea plucking machine is used, the selective collection of high-grade tea leaves can be satisfied, and the machine is easy to operate and high in efficiency.