Abstract: Based on the deformation characteristics of the rotary rolling process, the engineering plastic mechanics method is used to establish the analytical calculation method for unit rolling pressure.Accordingly analyzed here in the paper are the geometrical relationship between the rotary rolling space structure and the deformation characteristics and the deformation characteristic cross section in the rotary rolling deformation zone, and the stress status of the deformation unit block.As a result the stress calculus equation of the deformation block is obtained, and in turn the calculation formula for the unit rolling pressure of the rotary rolling process is solved, and subjected to verification with relevant living examples.This analytical calculation method is applicable to calculation of general rotary rolling force mechanics parameters as well as analysis of rolling deformation stress and strain.