The invention discloses a hub motor controller and a control method. The process is as follows: a wheel velocity V, a hub motor coil temperature T, a motor controller temperature TC, and time t for which the hub motor coil temperature and the motor controller temperature exceed a set temperature are monitored in real time; monitored information is subjected to comparative judgment with set wheel velocity, hub motor coil temperature, motor controller temperature, time and wheel torque respectively; and a low-velocity high-carrier-frequency quasi-direct-current square wave control motor or a high-velocity sine wave control motor is adopted according to different judgment results. Various information of a vehicle is monitored in real time, the monitored information is subjected to the comparative judgment with set values, and an alternate compound control method of low-velocity high-carrier-frequency quasi-direct-current square wave control and high-velocity sine wave control is adopted according to the different judgment results, so that the requirements that the off-road vehicle outputs a large torque at a low velocity and stably runs at a high velocity are met.