The invention discloses a marine anti-tilt device. The marine anti-tilt device comprises a gravity center adjustment device and a pressure bin adjustment device, wherein the gravity center adjustmentdevice comprises a gravity center adjustment column, an air bag, an inflating device and a first pipe; the gravity center adjustment column is externally connected with the body of a ship through thefirst pipe; the air bag is connected with the inflating device; and the inflating device is connected with a switch on a steering wheel. When the rotating angle of the steering wheel exceeds 30-90 degrees, a switch for the reverse direction in which the ship rolls over easily can be switched on automatically, at the time, the corresponding driving motor can drive an inflating barrel to inflate airinto the air bag, after the air bag is expanded, water in the gravity center adjustment column can be drained out of the body of the ship through the first pipe, and therefore, balance of the body ofthe ship is maintained; and when the range of the rotation angle of the steering wheel is 0-25 degrees, the switch which have been switched on can be switched off automatically, the corresponding airbag valve can be opened, thus, air is discharged from the air bag, then water flow immediately enters the gravity center adjustment column, and balance of the body of the ship is maintained.