The invention relates to a microfluid cooling silicon wafer level LED illuminating system which comprises a silicon wafer substrate (1), wherein the upper surface of the silicon wafer substrate (1) is provided with a plurality of LED chips (2). The microfluid cooling silicon wafer level LED illuminating system is characterized in that the silicon wafer substrate (1) is provided with a micro-cooling channel through which cooling liquid passes, and the micro-cooling channel is provided with an inlet and an outlet which are communicated with exteriors; and the position of the micro-cooling channel corresponds to the LED chips (2) arranged on the upper surface of the silicon wafer substrate (1). In the LED illuminating system of the invention, the cooling liquid channel structure is directly arranged on the silicon wafer substrate, and the LED chips are cooled by adopting the cooling liquid through the micro-cooling channel, therefore, the heat radiation effect of the LED chips is improved, the integration degree of the LED illuminating system is greatly improved, the size of an LED illuminating product is shortened, and the production cost of the LED illuminating product is greatly reduced. The invention is beneficial to the application and the popularization of the LED illuminating product.