A steering-based automobile flat tire prevention control system relates to automobile safety control devices and comprises an automobile steering wheel, a steering wheel corner sensor, a steering shaft, a universal coupling shaft, a steering pinion wheel, a transmission gear, an electrical control clutch, a steering motor, a flat tire control ECU (Electronic Control Unit), a vehicle speed sensor, a vehicle body heeling sensor, an indicator light, a horn alarm, a steering wheel, a wireless tire pressure sensor, a steering tie rod, a steering rack and a tie rod displacement sensor. When a tire is flat, a flat tire alarm device is started, then the indicator light and the horn alarm give flat tire prewarning information, the steering motor is turned on through the electrical control clutch so as to control the steering system of an automobile to be in a automobile flat tire prevention control state, so that the automobile is prevented from being out of control or even off tracking when one tire is flat.