The invention provides a cooling system. Cooling pipes having an included angle with the vertical direction are arranged in a cooling bin so that the cooling pipes can have a cooling effect on particulate matter which falls in a batched manner when touching the particulate matter and can also block the particulate matter and reduce the descending speed of the particulate matter when the particulate matter falls, the cooling time of the particulate matter is prolonged under the same height condition of the particulate matter, and therefore the cooling effect of the particulate matter is greatly improved; the batched particulate matter can fall at the same time to enter a feeding port of the cooling bin so that the cooling efficiency of the particulate matter can also be greatly improved; and in addition, due to the fact that a large-capacity cooling bin or large-volume cooling liquid is not needed in the cooling system, the problem that the water quantity of an existing cooling bin is large, and consequently water leakage is prone to happening is solved as well under the condition that cost and space are saved.