<p>The prediction of the rolling force and thickness ratio plays an important role in the development and application of bimetallic composite plates. To analyze the rolling force of the bimetallic composite plate more accurately, a novel hypothesis based on Orowan’s theory was proposed. The variation in the thickness of each differential element at different positions was considered to establish the analytical model. According to the characteristics of bimetallic composite plate rolling, the rolling deformation can be divided into forward and backward slip zones. The initial thickness ratio after rolling was predetermined by the thickness ratio before rolling; the rolling force balance of the upper and lower rollers was considered the convergence condition; and the final thickness ratio of the bimetallic composite plate was obtained by iterative calculation. The calculation results of the analytical model were compared with the measured and simulated data. The results showed that the errors in the calculation of the rolling force and thickness ratio were both less than 10%. The analytical model has high precision, meets engineering requirements, and has important reference significance for rolling process optimization and thickness ratio prediction.</p>