A receptacle-type bi-directional optical module includes an optical connector, a bi-directional optical sub-assembly (BOSA), and a flexible printed circuit board. The bi-directional optical sub-assembly is detachably coupled to the optical connector. The bi-directional optical sub-assembly includes a transmitter end and a receiver end. The flexible printed circuit board includes a board body, a first connection part, and a second connection part. A first end of the board body is electrically connected to a printed circuit board. The first connection part is connected to a second end of the board body for electrically connecting to the transmitter end. The second connection part is connected to the edge of the first connection part for electrically connecting to the receiver end.