The invention discloses an automobile brake pad detection and auxiliary brake system which comprises a brake pedal, wherein the brake pedal is used for controlling two brake pads to be sped up; a distance sensor is mounted between the two brake pads and is used for monitoring the distance between the two brake pads in real time and transferring the distance to an automobile center control computer; a pressure sensor is used for monitoring the pressure when a brake caliper reaches a maximum stroke and transferring the pressure to the automobile center control computer; the automobile center control computer detects whether the pressure when the brake caliper reaches the maximum stroke reaches a preset value or not; and if the pressure does not reach the preset value, the automobile center control computer enables a switch to be closed to conduct two electromagnetic chucks of a circuit of the switch to mutually attract. By virtue of the principle, real-time monitoring on brake pads of adisc brake is realized; before the brake pads are used up, a driver can be timely reminded of replacing the brake pads; but if the driver forgets to replace the brake pads, under the condition of no brake force or weaker brake force, the stroke of the brake caliper is increased so as to increase the brake force, thereby reducing the injury to personnel and an automobile.