AM 300L-P laboratory mixer adopts compact series-excited micro-motor drive, which is suitable for mixing low to medium and high viscosity liquids in laboratories or pilot plants. The machine is exquisitely designed and composed of a drive motor, a torque-increasing mechanism and a speed controller. The main mixer adopts high-density die-cast aluminum alloy as the body, and the running state is stable; the output end uses a force-increasing speed-changing mechanism to double the output torque. It has the characteristics of large output power, high torque and convenient speed regulation.