The invention discloses a low-speed large torque permanent magnet motor drive system for a small space. The system comprises a motor, a rectangular axis reducer actively connected on an output shaft of the motor, and a transducer flexibly connected on the motor, and the system is characterized in that the motor is a low-speed large torque permanent magnet synchronous motor, an output shaft of thelow-speed large torque permanent magnet synchronous motor and an output shaft of the rectangular axis reducer form a 90-degree included angle, the output shaft of the low-speed large torque permanentmagnet synchronous motor is linked with an input shaft of the rectangular axis reducer through a spline coupler, the shell of the low-speed large torque permanent magnet synchronous motor is connectedwith the shell of the rectangular axis reducer, and the rectangular axis reducer is a single-stage reducer. The low-speed large torque permanent magnet motor drive system has the beneficial effects that the low-speed large torque driver for the equipment has characteristics of small volume, light weight, low rotating speed, large torque, high efficiency and energy conservation, lower material cost, and convenience in installation and maintenance compared with traditional driving manner.