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This invention relates to the field of film shrinkage measurement technology, encompassing clamping plates, a fixture for preventing sample strip detachment, and a device for measuring the heat shrinkage properties of films. The fixture includes fastening bolts and two symmetrically arranged clamping plate bodies. The fastening bolts pass through and connect the two clamping plate bodies, clamping the sample strip between them. A first arc-shaped groove is formed on one side of each clamping plate body, and a second groove extending perpendicular to the length of the sample strip is formed on the opposite side. A rubber pad is placed within the second groove, and the rubber pad has several protrusions arranged in an array to compress the end of the sample strip. This clamping plate structure increases the friction between the clamping plate and the sample strip, making it less likely for the sample strip to detach. Simultaneously, the clamping force is evenly distributed, avoiding localized damage to the sample strip and reducing the risk of detachment. The control system of the film heat shrinkage performance measuring device combines the detected pressure data to control the device's operating status in real time, reducing wasted time and improving testing reliability.