The invention discloses a sensor fixing structure, an anti-lock braking system and an automobile. According to the sensor fixing structure, an axle shaft tube is provided with a plurality of mountingstations, the plurality of mounting stations are arranged in the radial direction of the axle shaft tube at intervals, a fixing seat is detachably connected to any mounting station, and a sensor is detachably connected to the fixing seat. According to the sensor fixing structure, the sensor is detachably connected the fixing seat, so that the disassembly and assembly operation of the sensor is convenient; meanwhile, the fixing base is detachably connected to any mounting station so that the fixing base can be mounted at any position without affecting the using effect of the sensor; and the sensor fixing structure is simple in structure, and the disassembly and assembly and position adjusting of the sensor are convenient.