The rolling test of 55SiCrA spring steel wire rod was carried out with different finishing rolling temperature and laying temperature. The results show that different rolling processes can form different types of complete decarburization. Through temperature measurement and metallographic examination of process samples, it is found that the surface of the rolled piece has formed a complete decarburization layer during the rolling process. However, by setting proper finishing rolling temperature and laying temperature, the deformation heat of high-speed rolling can transform complete decarburization into austenite and avoid complete decarburization of 55SiCrA spring steel wire rod.