A liquid cooling system (100) for removing heat from a heat-generating component is disclosed. The liquid cooling system includes a heat-absorbing member (20), a heat-dissipating member (30), a pump (50) and a mounting mechanism (10, 60). The heat-absorbing member defines therein a fluid flow channel (26) for passage of a coolant. The pump is in fluid communication with the heat-absorbing member and the heat-dissipating member for driving the coolant to circulate between the heat-absorbing member and the heat-dissipating member. The mounting mechanism includes a bottom portion (10) and a top portion (60) cooperating with the bottom portion to define therebetween a receiving space. The heat-absorbing member, heat-dissipating member and pump are received in the receiving space and are mounted to the mounting mechanism.