Drainage bag clamp with variable clamping force

The invention discloses a drainage bag clamp with variable clamping force. The drainage bag clamp comprises a front clamping plate and a rear clamping plate which are oppositely and vertically arranged, rightward clamping arms are fixed to the middles of the right ends of the clamping plates, a first guide rod forwards penetrating through the clamping arms on the front side is fixed to the clamping arm on the rear side, and a front pinching plate is fixed to the front end of the first guide rod; and the front pinching plate is connected with the clamping arm on the front side through a first spring connected to the first guide rod in a sleeving mode, two second guide rods which penetrate through the clamping arm on the rear side backwards and are located on the left side and the right side of the first guide rod are fixed to the rear end of the clamping arm on the front side, and the rear ends of the two second guide rods are connected through a rear pinching plate. A first rope hole is formed in the clamping