Automatic ship bottom surface repairing method

The invention provides an automatic ship bottom surface repairing method, and relates to the technical field of marine equipment manufacturing processes. According to the ship bottom surface automatic repairing method, a ship body repairing robot is applied, local damage of a ship body of a ship can be repaired, firstly, a carrying platform is adsorbed to the ship body, a driving roller is made to move to the position of a to-be-repaired area along the ship body, and attachments in the to-be-repaired area of the ship body are removed through a rough grinding mechanism; then a mechanical arm of the fine trimming mechanism is selectively connected with an ultrasonic flaw detector, a breaking and trimming unit, a welding unit and a paint spraying unit, the ultrasonic flaw detector is used for detecting the positions with defects in the to-be-repaired area of the ship body, and the breaking and trimming unit is used for cutting, striking and polishing the positions with the defects of the ship body; a ship body m