A copper alloy plate, strip and foil low-temperature stress-relieving tension straightening process. The process steps are: uncoiling→degreasing→ primary brushing→primary drying→low-temperature stress-relieving tension straightening→pickling→secondary brushing→passivation→secondary Drying→rewinding; the present invention adopts unfolding stress relief annealing, which eliminates part of the residual internal stress of the material, and meets the requirements for deep processing of copper alloy materials, and especially can better meet the requirements of etching and half etching of high-end frame materials. The use of "large tension straightening" in the environment improves the shape of the copper plate, strip and foil, and eliminates the slight edge waves before annealing and other poor shape materials such as the stress relief and annealing, which will remain in the original state, while the plastic and electrical properties of the material have been improved. The copper strip is expanded through annealing, which avoids the uneven annealing phenomenon and solves the current domestic copper alloy plate, strip and foil deep processing requirements for internal stress, especially the requirements for half-etching of high-end frame materials, and the etched copper plate does not show warpage and distortion.
