Synchronous belt tensioning structure and camera

The utility model relates to a synchronous belt tensioning structure and a camera. The synchronous belt tensioning structure comprises a base, a motor fixing plate and an elastic piece, synchronous wheels are arranged on the base and the motor fixing plate, and a synchronous belt is in transmission connection between the two synchronous wheels; a first limiting stud and a clamping stud are fixedly arranged on the base, the first limiting stud comprises a supporting part and a limiting part located on the side, away from the base, of the supporting part, and the supporting part and the clamping stud are equal in height and can support the motor fixing plate; a first limiting hole is formed in the motor fixing plate, and the limiting part penetrates through the first limiting hole, so that the motor fixing plate can move or rotate relative to the limiting part; the two ends of the elastic piece are fixed to the base and the motor fixing plate respectively, so that the motor fixing plate keeps stress balance bet