Belt tension adjusting device

The utility model discloses a belt tension adjusting device which comprises a positioning unit, an adjusting rope and an adjusting structure, and the positioning unit abuts against a mounting seat of a motor; the two ends of the adjusting rope are aligned and penetrate through the positioning unit, and the positioning unit divides the adjusting rope into a fixing ring and an adjusting section used for adjusting the size of the fixing ring. The adjusting structure is provided with a first fixing piece, an adjusting piece and an operating piece, the adjusting section penetrates through the positioning unit, and the first fixing piece, the adjusting piece and the operating piece and the adjusting section are fixed to the operating piece. The motor is sleeved with the adjusting rope (preferably a nylon braided rope), on one hand, mechanical contact is converted into flexible contact, no mechanical deformation is generated, the adjusting rope is low in cost and easy to obtain, and the adjusting loss cost of the mo