A probe connector adapted for electrically interconnecting with a mated connector which has two portions thereof provided with different magnetism selected from a south magnetic pole and a north magnetic pole respectively, includes an insulating housing, a plurality of probe pins and a foolproof mechanism. The insulating housing defines a plurality of inserting holes penetrating therethrough for receiving the probe pins. The foolproof mechanism is made of magnetic material and includes an upper cover and a lower cover which have different magnetism selected from a north magnetic pole and a south magnetic pole respectively. The upper cover and the lower cover are mounted to two opposite sides of the insulating housing. The probe connector can be interconnected with the mated connector based on principles of homopolar repulsion and heteropolar attraction between the upper cover and the lower cover and the two portions of the mated connector.