A heat sink, comprising: a plurality of water pipes extending into a longitudinal direction, wherein each of the plurality of water pipes includes a mouth portion defining an opening, and a body portion connected to the mouth portion; the mouth portion including two opposite extensions, a first curved portion connecting the two extensions, and a second curved portion connecting the two extensions and located opposite to the first curved portion; the two extensions, the first curved portion and the second curved portion defining the opening; and a reinforcing connecting assembly comprising a plurality of linking pieces and a connecting plate; each of the linking pieces extends towards the longitudinal direction has a substantially V-shaped cross-sectional profile formed by a connecting wall and two opposite side walls connected with the connecting wall; the connecting wall has a first surface abutting the first curved portion and a second surface opposite to the first surface; each of the two side walls includes a reinforcing portion, a guiding portion located at a distance of the reinforcing portion in longitudinal direction and an extending portion located between the reinforcement portion and the guiding portion; wherein the connecting plate connects the connecting wall of each of the linking pieces and adjoins the reinforcing portion; characterised in that the first surface of the connecting wall of each of the linking pieces abuts the first curved portion of the mouth portion and the body portion, while the reinforcing portions of the two side walls of each of the linking pieces rest on the two extensions of the mouth portion, while the extending portions and the guiding portions of the two side walls of each rest on the body portion; wherein the distance between the two reinforcing portions of each linking piece is greater than the distance between the two guiding portions of each linking piece, such that the connecting wall and the reinforcing portions of the two side walls of each of the linking pieces guide a water flow in the first curved portion of each of the water pipes and avoid the water flow from directly flushing the first curved portion. a plurality of water pipes extending into a longitudinal direction, wherein each of the plurality of water pipes includes a mouth portion defining an opening, and a body portion connected to the mouth portion; the mouth portion including two opposite extensions, a first curved portion connecting the two extensions, and a second curved portion connecting the two extensions and located opposite to the first curved portion; the two extensions, the first curved portion and the second curved portion defining the opening; and a reinforcing connecting assembly comprising a plurality of linking pieces and a connecting plate; each of the linking pieces extends towards the longitudinal direction has a substantially V-shaped cross-sectional profile formed by a connecting wall and two opposite side walls connected with the connecting wall; the connecting wall has a first surface abutting the first curved portion and a second surface opposite to the first surface; each of the two side walls includes a reinforcing portion, a guiding portion located at a distance of the reinforcing portion in longitudinal direction and an extending portion located between the reinforcement portion and the guiding portion; wherein the connecting plate connects the connecting wall of each of the linking pieces and adjoins the reinforcing portion; characterised in that the first surface of the connecting wall of each of the linking pieces abuts the first curved portion of the mouth portion and the body portion, while the reinforcing portions of the two side walls of each of the linking pieces rest on the two extensions of the mouth portion, while the extending portions and the guiding portions of the two side walls of each rest on the body portion; wherein the distance between the two reinforcing portions of each linking piece is greater than the distance between the two guiding portions of each linking piece, such that the connecting wall and the reinforcing portions of the two side walls of each of the linking pieces guide a water flow in the first curved portion of each of the water pipes and avoid the water flow from directly flushing the first curved portion.