Method and system for automatically opening and closing charging cover of transportation tool, charging gun and transportation tool

The invention relates to a method and system for automatically opening and closing a charging cover of a transportation tool, a charging gun and the transportation tool. The method comprises the following steps: carrying out near-field communication between the transportation tool and the charging gun, wherein the transportation tool and the charging gun are separately provided with a first moduleand a second module which are used for near-field communication; acquiring a near-field communication signal between the first module and the second module; judging whether at least one part of the charging gun has been currently located in a first area or outside a second area according to the acquired near-field communication signal, wherein the first area and the second area are respectively defined as an area which is distant from the preset position on the transportation tool by a preset first distance and an area which is distant from the preset position on the transportation tool by apreset second distance, and the first distance and the second distance are equal or unequal; executing the following operations according to the judgment result: if the charging gun is determined to be located in the first area, controlling a charging cover to be in an open state for exposing a charging port; or if the charging gun is determined to be located outside the second area, controlling the charging cover to be in a closed state to close the charging port.