The present invention provides an installation method for anti-rolling structures at the two ends of the bottom of an A-shaped independent liquid cargo tank. Each anti-rolling structure comprises a matching support installed at the bottom face of the liquid cargo tank, and two limit supports installed at the inner bottom of a liquefied gas carrier, and each matching support is arranged between the two corresponding limit supports. The installation positions of the anti-rolling structures are obtained through calculation according to the actual sizes of the liquid cargo tank and the liquefied gas carrier, the matching supports and the limit supports are manufactured respectively and the concrete structures thereof are obtained according to the test and simulation to meet the requirements of work to the maximum, the matching supports and the limit supports are installed on the liquid cargo tank and the liquefied gas carrier after being manufactured, laminated wood is then installed and adjusted, so that the positions of the matching supports and the limit supports meet work requirements, and finally, epoxy resin is poured between the matching supports and the limit supports to fix the positions of the laminated wood. By applying the installation method, the structure of a main hull can be guaranteed not to be damaged, and the construction is safe, reasonable and high in efficiency.