The invention relates to the technical field of automobile assembling, and discloses an automatic oiling device for automobile brake component assembling. The device comprises a bottom plate, side plates are arranged on the left side and the right side of the bottom plate, the upper parts of the side plates are fixedly connected with a top plate, a driving motor is arranged at the bottom of the side plate on the left side, an output shaft of the driving motor is fixedly connected with a rotating shaft, a first bevel gear is arranged at the lower part of the rotating shaft, the first bevel gearis in meshed connection with a second bevel gear, the second bevel gear is fixedly connected with the left end of a rotating rod, the right end of the rotating rod is provided with a fixed seat, theupper part of the rotating shaft is provided with a third bevel gear, the third bevel gear is in meshed connection with a fourth bevel gear, the fourth bevel gear is fixedly connected with the left end of a lead screw, and the middle of the lead screw is in threaded connection with a sliding seat. The automatic oiling device is suitable for automobile brake component assembling, a workpiece is driven to rotate through the rotating seat, so that a brush head which moves left and right is driven for oiling the surface of the workpiece, the oiling effect is better, and the oil layer on the surface of the workpiece is more uniform.