The invention discloses a system for a tank sloshing test by using an air-cushion floating technology, which comprises a horizontal excitation table, air cushions, an air floating table, a transfer tool device, a tank, a first force sensor, a pneumatic clutch, an excitation device, an excitation control system module, a data acquisition system module, an air floating control system module, second force sensors, and an acceleration sensor, wherein the horizontal excitation table and the air cushions are arranged at the bottom part of the air floating table; the horizontal excitation table is connected with four air cushions; the air floating table is aerated and then suspended at the upper part of the horizontal excitation table; the tank is arranged at the upper part of the air floating table through the transfer tool device and the four second force sensors; and the excitation device is connected with the air floating table through the pneumatic clutch and the first force sensor. The system can be applied to the sloshing test on the tank in different types and different specifications, the operation is simple, the reliability is strong, the cost is low and the structure is compact.