Abstract: A mini mill rolling model was established with Deform software and then was used to simulate temperature rise and strains of the AISI1015 steel workpiece with different specifications (φ8 mm, φ10 mm, φ13 mm) and different initial temperatures (800, 850, 900, 950 ℃) during the rolling process. The reason for the difference in rolling temperature rise was analyzed. The results show that the relative errors were within 13% between the mini mill rolling model simulation and the test results of the surface temperature of the workpiece when exiting the rolling mill. During the rolling process, the temperature rise and accumulated equivalent strains in the core of the workpiece were the largest, and the smaller the rolling specification, the greater the temperature rise and strain in the core. The lower the initial temperature of the workpiece, the greater the temperature rise and the torque. The uneven temperature rise of the workpiece with different specifications was mainly caused by the uneven distribution of equivalent strains; the obvious difference of the temperature rise in the core at different initial temperatures was caused by different rolling loads.