A blower housing is provided, including: two housing bodies and a positioning mechanism. Each of the two housing bodies includes a peripheral flange extending annularly. Two said peripheral flanges are detachably attached to and peripherally abutted against each other. One of the two said peripheral flanges has a lip protruding laterally therefrom, and the other of the two said peripheral flanges is at least partially overlapped with the lip. The positioning mechanism includes a first positioning portion which is disposed on one of the two housing bodies, and the first positioning portion is configured to be embeddedly engaged with a base.