Centrifugal fan and dust collection box module with the same

The invention provides a centrifugal fan and a dust collecting box module with the centrifugal fan. The centrifugal fan is characterized in the design of the shell, the fan shell of the invention has two characteristics, the first characteristic is that the width of the air flowing channel of the fan device is same, the second characteristic is that an axially central section line of the impeller inside the centrifugal fan divides the inner space of the fan device into two flowing channel spaces unsymmetric with each other, thereby the centrifugal fan can produce big flow capacity, big pressure differential and low noise through the two characteristics, the invention can provide a dust collecting box module by using the centrifugal fan, the centrifugal fan is used to collect the external dust through the dust collecting box structure, the effect of clean environment can be achieved.