A liquid cooling device is configured to be in fluid communication with a heat absorbing component. The liquid cooling device includes a first tank, a second tank, a third tank, and a channel structure. The second tank has a first connector, the third tank has a second connector, and the first connector and the second connector are configured to be in fluid communication with the heat absorbing component via pipes. The second tank and the third tank are in fluid communication with the first tank via the channel structure. Orthogonal projections of the second tank and the third tank onto the first tank do not overlap with each other.