Biomass briquetting technology is one of the key technologies about biomass energy. In this paper we established solid model of biomass plane-die briquetting machine by UG software and imported the model into software-ADAMS/View module to simulate the process and to analyse dynamic characteristic parameters. Under the conditions of the same spindle speed and different roller pressures, we obtained the characteristic curves of the main spindle bearing torque and the motor power. The results of simulation showed that the main spindle beared torque increased along with the increase of the roller pressure so that the needed motor power increased. The maximum simulated motor power is in the start-up stage through which we can get the correction coefficient k compared with the theoretical value. According to the above analysis, we got the dynamic characteristic model of the biomass plane-die briquetting machine which can provide theoretical basis for related equipment design.