A flatness correcting device and a method thereof

The invention discloses a flatness correcting device and a method thereof, and belongs to the field of ship machinery. The device comprises a control unit and four detection mechanisms respectively arranged at a reference test point and three auxiliary test points of an elevating platform. The reference test point is arranged on auxiliary pile legs of the elevating platform. The three auxiliary test points are respectively arranged on three elevating pile legs of the elevating platform. Each detection mechanism comprises a liquidometer and a piezoelectric conversion unit used for outputting a pressure value measured by the liquidometer to be electrical signals. The control unit is used for obtaining electrical signals output by the four detection mechanisms, and sequentially carrying out controlling of the elevating pile legs, where the three auxiliary test points are, according to pressure values expressed by the electric signals output by the detection mechanisms of the three auxiliary test points and the p