In order to promote the application and popularization of hydroforming technology in the field of lightweight, the springback characteristics of high-strength steel tubular components after hydroforming unloading at room temperature were investigated and verified by experiments and simulations, respectively, and the influences of process parameters (internal pressure, section fillet radius and wall thickness) on the forming accuracy were discussed. Then, the influence mechanism of each process parameter was revealed by mechanical analysis. The results show that due to the existence of internal pressure, the additional circumferential tensile force is generated during the hydroforming process of tubular components, which reduces the bending moment of section. Therefore, increasing the internal pressure appropriately has an inhibitory effect on the springback of section after hydroforming unloading. With the increasing of internal pressure, the springback amount increases first and then decreases, and there is a critical internal pressure. When the springback amount reaches the maximum value, the larger the radius of section fillet is, the greater the springback amount of section after hydroforming unloading is. The increase of wall thickness increases the flexural stiffness of section, and then causes the reduction of springback amount.