The utility model relates to a matching mistake-proofing device for an inner ring and an outer ring of a high-precision angular contact ball bearing. The utility model belongs to the technical field of bearing assembly, a first bearing inner ring containing table, a first bearing outer ring containing table, a second bearing inner ring containing table and a second bearing outer ring containing table are arranged on the upper end face of the base. Sensors are arranged on the first bearing inner ring placing table, the first bearing outer ring placing table, the second bearing inner ring placing table and the second bearing outer ring placing table, the sensors are connected with a controller through circuits, and the controller is connected with a loudspeaker arranged on the side wall of the base through a circuit. According to the utility model, the inner and outer rings of the bearing are respectively positioned by the sensors; operators need to take out the corresponding bearing inner and outer rings from the first bearing inner ring placing table, the first bearing outer ring placing table, the second bearing inner ring placing table and the second bearing outer ring placing table in sequence for assembly, and if wrong taking occurs, the controller controls the loudspeaker to give out an alarm sound to remind the operators.