The invention discloses an automatic repairing and remanufacturing method of a turbine blade and relates to the technical field of repairing and remanufacturing of turbine blades. The automatic repairing and remanufacturing method comprises the technological steps of scanning an original blade, establishing a three-dimensional model, conducting reverse modeling through a computer, planning a cutting area and a cutting path, conducting cutting, scanning a gap, conducting reverse modeling, conducting gap overlaying planning, conducting printing overlaying, conducting heat treatment, conducting nondestructive examination, conducting machining and conducting scanning. The determined blade is scanned through a robot 3D scanning system, the 3D model of the blade is obtained through software treatment, the to-be-cut area and the cutting path are defined on the model, and then the damaged portion is completely removed or an area to be manufactured is established. By the adoption of the technical scheme, the problems of water erosion damage repair of the blade, repair and upgrading of the blade and the like can be rapidly and efficiently solved at a high quality; and compared with traditional machining, the automatic repairing and remanufacturing method simplifies the machining technology, greatly improves the on-site machining efficiency of the blade and determines a new direction forefficient and intelligent repairing and remanufacturing for the damage of the turbine rotor blade.