The invention provides a hybrid integrated single-fiber three-direction device which comprises a substrate (100), a coarse wavelength division multiplexing array wave-guide optical grate (11), a first input wave guide (10), a first output wave guide (12), a second output wave guide (14), a second input wave guide (13), a laser (15), a first monitoring surface detector (16) and a second monitoring surface detector (17). The hybrid integrated single-fiber three-direction device simplifies the manufacture process, saves the cost, and can be used in low-cost EPON or GPON optical networks.