The invention discloses a horizontal-fluctuation blocking method of gas and liquid of a multi-overflow tower and the multi-overflow tower. The fluctuation blocking method of the multi-overflow tower comprises the following steps: step one, dividing a bubbling area of each layer of tower plate into a plurality of gas-liquid flowing areas; step two, arranging baffles in each bubbling area,, wherein the baffles are arranged in a direction from a liquid receiving disc to an overflow weir; and step three, enabling the gas and the liquid to flow along the baffles and limiting the flowing direction of the gas and the liquid by the baffles. The multi-overflow tower comprises tower plates, a liquid falling pipe, bubbling areas, an overflow weir, a liquid receiving disc and baffles, wherein each baffle comprises an upper edge, a plate body and a lower edge; a long hole is formed in the lower edge of each baffle. According to the horizontal-fluctuation blocking method of gas and liquid of the multi-overflow tower, the baffles are arranged in each bubbling area; the horizontal fluctuation of the gas and the liquid can be effectively reduced; the liquid level is relatively stable and uniform; the leakage of the liquid in wave peaks is reduced; the possibility of fog and froth entrainment in wave troughs is reduced; the mass transfer efficiency is improved; the probability of resonating a bubbling element and a tower device is effectively reduced; the problem of amplification effect of the tower device is effectively solved.