The invention discloses a motor bearing fault auxiliary protective structure. A bearing inner ring is sleeved on a motor rotor rotating shaft; a bearing outer ring is arranged in a seat hole of a motor end cover; an inner bearing cover and an outer bearing cover for blocking oil are arranged on the inner and outer sides of a bearing; the inner bearing cover and the outer bearing cover are fastened on the motor end cover by bolts; a self-lubricating shaft sleeve inner ring is provided with a plurality of oil storage grooves at intervals along the circumference; the self-lubricating shaft sleeve inner ring is sleeved on the motor rotor rotating shaft, and a self-lubricating shaft sleeve outer ring is arranged in an inner hole of the inner bearing cover or an inner hole of the outer bearing cover; the self-lubricating shaft sleeve inner ring is in clearance fit with the motor rotor rotating shaft; and the self-lubricating shaft sleeve outer ring is in clearance fit with the inner hole of the inner bearing cover or the inner hole of the outer bearing cover. The structure effectively protects the motor rotating shaft; and once the motor bearing fails and a rotor sinks, friction between the rotor and a stator is avoided, so that the whole motor is protected, economic loss is avoided, and normal operation of a production unit is ensured.