The utility model discloses a rock novel structure of phenomenon in suppression stabiliser, including being located inside last separator of stabiliser and separator down, to go up separator and separator down and all be the tubular structure that extends along the direction of height of stabiliser, the lower extreme of lower separator is fixed in the stabiliser bottom, goes up the separator and is fixed in down the separator top and goes up separator and separator intercommunication down, and the radial dimension who goes up the separator is greater than the radial dimension of separator down, and the upper end of going up the separator is the opening and describes. Upper and lower separator becomes inside and outside two parts with the inside space separation of stabiliser to reduced the space blade diameter length ratio, made and rock the more difficult emergence of phenomenon, limit the rate of flow of fluid simultaneously on radial, protected the container wall, simultaneously, can ensure that stabiliser base heating stick can not expose, in addition, the interior water level measuring precision of stabiliser has still been guaranteed. It is thus clear that this novel structure is favorable to improving nuclear power plant safety nature, reliability and economic nature.