An optical coupling device includes an optical coupling member, an optical-electrical converting module, and at least two optical fibers. The optical coupling member has a first under positioning portion. The optical-electrical converting module has a substrate, a base, an optical signal transmitter, and an optical signal receiver. The base is made of an insulating material and is provided on the substrate. The base has a receiving portion and a second under positioning portion to engage the first under positioning portion. The optical signal transmitter and the optical signal receiver are receiving in the receiving portion and face the first lens portion when the second under positioning portion engages the first under positioning portion. The optical fibers are beside the optical coupling member and face the second lens portion.