Heat exchanger radiating fin structure and heat exchanger thereof

A heat exchanger comprising:

• a radiating fin assembly composed of multiple radiating fins arranged at intervals parallel to each other, each two adjacent radiating fins defining therebetween a flow way, such that three consecutive radiating fins define two consecutive flow ways the two flow ways defining a first inlet, a second inlet, a first outlet and a second outlet in the radiating fin assembly, respectively, the first inlet being opposite to the first outlet, while the second inlet is opposite to the second outlet, each radiating fin having a main body, the main body having a first plane face and at least one lateral side, multiple depressions being formed on the first plane face, each radiating fin further having at least one rib disposed on a portion of the first plane face, which portion is free from any of the depressions, the rib obliquely extending in one direction neither normal nor parallel to any lateral side of the first plane face;
• wherein the at least one rib has a top portion, a front edge and a rear edge, wherein the front edge of each rib is formed substantially at a right angle to said top portion and the rear edge of the rib is formed as an arcuate section from the top portion to the the first plane face.