The invention provides a ship balance anti-sinking mechanism used for preventing a ship from sinking. The ship comprises a hull inner shell and a hull outer shell. The mechanism comprises a first balance anti-sinking mechanism body and a second balance anti-sinking mechanism body. The first balance anti-sinking mechanism body is arranged on the hull outer shell and comprises a balance board, connecting mechanisms and a hydraulic device. The balance board is rotationally connected to the hull outer shell through the connecting mechanisms. The connecting mechanisms are connected with the hydraulic device through pipelines and used for controlling the movement of the balance board under driving of the hydraulic device. The second balance anti-sinking mechanism body is a hull floating interlayer arranged between the hull inner shell and the hull outer shell. A floating material is arranged in the hull floating interlayer. By the adoption of the ship balance anti-sinking mechanism, the ship can be effectively prevented from sinking.