The invention provides a clamping device for connection. Through a stop member (8), the fastening force of a fastening belt (3) to a fastening part (2) can be maintained consistent. Through the rotation of a bolt (5), another end side (3B) of the fastening belt conducts relative sliding on the upper surface of one end side (3A), but the sliding amount of another end side (3B) is limited by the stop member (8). With the adoption of a fastening tool having fastening torque, a certain fastening force can be applied to the fastening belt (3). Accordingly, the fastening force of a fastening belt (3) to a fastening part (2) can be maintained consistent, high quality of a clamping device for connection (1) can be ensured, and production efficiency can be improved.