The invention discloses an advertising board base seat capable of automatically sweeping ash. The advertising board base seat comprises a pedestal. Two stand columns are symmetrically arranged on the top surface of the pedestal; the stand columns are cooperated with sleeve columns; column bodies of the sleeve columns are provided with two annular sleeves respectively; the external surface of each annular sleeve is provided with a first stand column; the outside of the sleeve column is provided with a bearing plate; the inner side of the bearing plate is symmetrically provided with two insertion sleeves cooperated with the first stand column; connection columns are arranged between the two sleeve columns; the external surface of each annular sleeve is provided with a first insertion sleeve cooperated with the connection columns; one end of the bearing plate getting far away from the sleeve column is provided with more than one wave absorbing block; an ash sweeping device is arranged on the top surfaces of the sleeve column; and advertising boards are mounted on the top of the ash sweeping device. The advertising board base seat capable of automatically sweeping ash has strong pressure bearing capacity, great rigidity, a stable pedestal and a function of automatically sweeping ash.