The invention discloses an aircraft damage metal micro-droplet jetting 3D printing in-situ rapid repairing method which is used for solving the technical problem that existing aircraft damage repairing methods are poor in practicability. According to the technical scheme, a metal melt jets single uniform micron-grade metal droplets through a nozzle under the action of the internal pressure of the metal melt, the uniform metal micro-droplets are controlled to be directionally accumulated point by point and layer by layer according to the specified trajectory based on the dispersed accumulation principle, and then rapid repairing forming of damaged metal parts is completed. According to the aircraft damage metal micro-droplet jetting 3D printing in-situ rapid repairing method, large-size energy equipment and special raw materials are not needed; in-situ repairing of multi-material damaged parts including active metal can be achieved; repairing equipment is portable; the process is simple; the cost is low; in-situ flexible rapid repairing of aircraft damage can be completed; and the practicability is high.