The invention relates to an automatic pruning machine for expressway halving belt anti-dazzle plants. The automatic pruning machine comprises a power system, a walking system, a pruning system, a branch and leaf collecting system, a branch and leaf processing system, an intelligent system and a control system, wherein the power system consists of an engine, a speed changing box, a transfer case, a hydraulic motor and a hydraulic pump; the walking system consists of an engine, a speed changing box, a transfer case, a differential mechanism, a drive axle and tires; the pruning system consists of a pruning arm, a driving shaft, a pruning device and a feed unit; the branch and leaf collecting system consists of a high-power dust collector, a suction pipe, a dust collecting arm and a branch and leaf collecting box; the branch and leaf processing system comprises a high-temperature box, a crusher and a storage bag; the intelligent system comprises hardware, analysis and judgment software and an operation instruction; the control system comprises a control element, control software and an operation switch. The automatic pruning machine has the advantages of convenient construction, low labor cost and good pruning effect.