According to the present invention, disclosed are a channel sign board and a manufacturing method thereof. The channel sign board comprises: a sign case having a through-hole in a side surface; a light emitting lamp installed on the inner surface of the sign case to emit light; an advertisement panel installed on the front surface of the sign case, and making advertisement content of an outer surface recognized from the outside by the light emitted from the light emitting lamp; and a reflection member to reflect the light which is emitted from the light emitting lamp and goes out through the through-hole formed in the side surface of the sign case. According to the present invention, a portion of the side surface of the sign case is cut and tapered toward the outside at a predetermined angle, a hole formed on the side surface of the sign case while being cut in the sign case becomes a through-hole. A part cut in the sign case to be inclined towards the outside at a predetermined angle becomes the reflection member. Accordingly, when lighting through the side surface of a channel sign is required, side surface lighting is realized without an individual side surface light emitting lamp, so advertisement effect is doubled with a smooth lighting effect through the side surface of the channel sign.
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