It can provide a theoretical basis for quantitatively analyzing the force on mechanism and energy consumption to build model of material molding process for vertical circular mould straw briquetting machine. On the basis of analysis on structure and working principle of core work unit on vertical circular mould straw briquetting machine, the models of forces on roller and molding energy consumption are established, and the load distribution curves and molding energy consumption curves are drawn under different technical parameters, and finally, the optimization method of technical parameters is proposed. Theoretical analysis results show that the eccentric design of molding hole can improve load distribution of the rollers, and reduce the energy consumption per ton of material. The eccentric angle of molding hole is related to the friction coefficient between equipment and materials as well as diameter ratio of roller to circular mould. The optimal eccentric angle of molding hole is greater when the friction coefficient between equipment and materials and diameter ratio of roller to circular mould are greater. The eccentric design of molding hole can reduce energy consumption from 0.29% to 3.58%. Finally, through the device comparison test, the above conclusions are confirmed. The research provides a theoretical reference for the design of key technical parameters.