An optical communication device provided with digital optical switching includes a substrate; and at least one optical switch including a first optical switch composed of a main core disposed on the substrate and extending along a first direction, the main core including an optical input part and a transmission output part sequentially arranged along the first direction; a heater extending along a second direction to cross the main core; and a reflection output part extending along a third direction from a central point of the main core. The first direction and the second direction define a first angle there between, the second direction and the third direction define a second angle there between, and the first angle is equal to the second angle. An optical signal is outputted through the reflection output part or the transmission output part in response to heat from operation of the heater.