The invention provides a shoot harvester with a multi-stage speed reduction and reversing branch shifting mechanism. The shoot harvester comprises a rack with a handrail, an engine which is fixedly mounted on the rack, a double belt pulley, a horizontal wheel shaft mounted on the rack, a travelling vertical transmission shaft mounted on the rack, a harvesting shifting vertical transmission shaft mounted on the rack, a branch shifting horizontal transmission shaft which is mounted on the rack and moves in the front and back direction of the rack, a front limiting plate fixed on the rack, a rear limiting plate fixed on the rack, a branch shifting horizontal shaft sleeve which sleeves the branch shifting horizontal transmission shaft, a branch shifting vertical transmission shaft which is mounted on the rack, a branch shifting mechanism which is mounted at the upper end of the branch shifting vertical transmission shaft, a positioning plate which is fixed on the branch shifting horizontal transmission shaft, a spring which sleeves the branch shifting horizontal transmission shaft, and a reversing pulling line of which one end is fixed to the rear end of the branch shifting horizontal transmission shaft and while the other end is movably arranged on the handrail. The shoot harvester is convenient to operate, simple in structure, and easy to be manufactured.