Earphone capable of adaptively adjusting length of headband

The utility model discloses an earphone capable of adaptively adjusting the length of a headband, which comprises two main body parts and a headband assembly connected with the two main body parts, an enclosed area formed by the two main body parts and the headband assembly corresponds to the shape of the head of a human body, and the main body parts are rotatably connected with the headband assembly. The rotation directions of the two main body parts are as follows: the two main body parts can rotate oppositely or reversely, and the area of the enclosed area is enlarged or reduced through rotation; the head band assembly comprises an elastic telescopic part located in the middle and connecting parts located on the two sides of the elastic telescopic part, one end of each connecting part is connected with the elastic telescopic part, and the other end of each connecting part is rotationally connected with the main body part. According to the utility model, the angle of the main body part and the telescopic le