The disclosure disclosed herein relates to the provision of an automatic flag hoisting device which is simple in structure and has high production convenience and is capable of transmitting advertisements remotely. According to one embodiment of the present disclosure, an automatic flag hoisting device includes a case coupled to both sides of a support formed on a street light or a power pole, a flag portion formed inside the case and including a flag, and driving A driving unit for pulling or fixing the flag through the control unit; a control unit connected to external terminals through a wired or wireless connection; and a display unit for starting an image transmitted through the control unit, wherein the control unit includes an image transmitted from the terminal. Transmit the data to the display unit to advertise the image.
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