The invention relates to a guide clamping lock type high branch pruning and stubble protecting saw which comprises a shell mechanism, a clamping mechanism, a pruning mechanism and a stubble maintaining mechanism, wherein the shell mechanism comprises a main shell, a bearing overhaul cover, an auxiliary shell and a saw blade overhaul cover; the clamping mechanism comprises a first clamping jaw, a second clamping jaw, a clamping spring, a clamping brake cable and a clamping push rod; the pruning mechanism comprises a motor, a bevel gear, a coaxial gear, a guide plate, a bearing, an eccentric wheel, a cylindrical gear, a connecting rod, a sliding block, a pesticide storage saw blade, a pruning brake cable, a pruning push rod and a guide plate spring; the stubble maintaining mechanism comprises a sector-shaped sprayer, a pesticide conveying pipe and a pesticide liquid box. The guide clamping lock type high branch pruning and stubble protecting saw can carry out stubble maintaining while pruning according to agricultural requirements of branch pruning and stubble maintaining, prevent the stubbles from being infected by viruses, guarantee stable and high yield of high-yield plantations, and promote sustainable development of forestry.