The invention discloses a fault detection method for a bogie sensor, and the method comprises the following steps: obtaining a detection signal of the sensor in a preset time period, and performing the corresponding disconnection abnormality detection according to the type of the sensor, wherein when the sensor is a key-phase sensor and the detection signal is a key-phase signal, the disconnectionabnormality detection specifically comprises the substeps: judging whether the maximum value of the key-phase signal is greater than a triggering value or not: determining that the key-phase sensor does not have the disconnection abnormality if the maximum value of the key-phase signal is greater than the triggering value, or else exiting from a detection program. The method can achieve the judgment of whether the connection of the sensor is normal or not according to the type of the sensor, so as to guarantee that a detection signal is an effective signal when the sensor is determined to bein the normal detection state, and guarantee the accuracy of the corresponding working state, detected by the sensor, of a bogie.