The invention discloses a single fiber bi-directional device based on PLC technology, which comprises an optical chip with a wavelength division multiplexing function and manufactured with the PLC technology; a laser chip which is used to produce optical signals; a detector chip which is used to receive optical signals; optical fiber or optical fiber stubs; a packaging shell with a fiber hole and an electric angle; the optical signal input/output waveguide port on the optical chip is in coupling connection with the optical fiber, the laser chip and the detector chip are in coupling connection with the corresponding waveguide ports on the optical chip respectively, the whole optical combination chips are fixed in the packaging shell, the optical fiber is pulled through the fiber hole on the shell, electrodes of the laser chip and the detector chip are connected with the electric angle respectively and the inside of the shell body is in leakage isolation with the outside .