The present invention relates to the unmanned aerial vehicle wireless charging technology field, and discloses a method and system for automatic wireless charging of an unmanned aerial vehicle. In the unmanned aerial vehicle automatic wireless charging method, a four-step localization method is employed and comprises: firstly, performing coarse positioning through a satellite, and obtaining a coarse positioning area; secondly, performing fine positioning at the coarse positioning area through adoption of infrared ray intensity, and obtaining a fine positioning area; thirdly, performing finer positioning at the fine positioning area through adoption of laser enclosed to a certain area, and obtaining a finer positioning area; and fourth, detecting point laser at the finer positioning area, obtaining final positioning, and performing automatic wireless charging after the final positioning. The positioning precision is very high, the algorithm is simple, the calculation amount is little, the positioning speed is fast, the wireless charging efficiency and the unmanned aerial vehicle cruising ability are greatly improved, the requirement for the hardware performance is low, and the cost is greatly reduced.