The invention discloses an air negative pressure differential tool bit leaf harvester. The harvester comprises a tubular nose, a collecting tank, a negative pressure machine, corrugated pipelines, a support pipe and a trolley. The leaf harvester adopts air negative pressure transmission driving and the differential rotation of multi-group cutting blades of the tubular nose is realized, thereby repeatedly cutting leaves to obtain small leaf fragments. The cut leaf fragments are collected and processed. The harvester can be used for harvesting leaves and tender branches and buds of broussonetia papyrifera in a large space range, also can be widely applied to pruning of jungles and shrubs in the field of landscaping, and integrates harvesting, pruning and collecting and processing, so that the labor intensity is greatly reduced, and the working efficiency is improved.