Regarding the cracking problem of mass concrete of ship lock, the thermodynamic and deformation properties of concrete with different mix ratios are studied by laboratory tests. Based on multi-field coupling model, cracking risk calculation of corridor structure concrete has been carried out. The research results show that the addition of anti-cracking agent reduces the drying shrinkage and produces large expansion at the initial stage of autogenous volume deformation, which significantly improves the volume stability and anti-cracking performance of concrete. The anti-cracking agent can reduce the maximum cracking risk coefficient of the ship lock corridor structure concrete by more than 40%, and make the cracking risk of the corridor concrete below 0. 7, which greatly reduces the risk of structural concrete cracking.