A connecting mechanism for connecting a first housing and a second housing together is provided. The second housing defines a slot. The connecting mechanism includes a fixing member fixed on the first housing, two connecting elements, and a movable member. The two connecting elements are connected to the fixing member, and each connecting element comprises a main body, a pin protruding from the main body, and an enlarged head on the pin. The movable member comprises two sliding grooves. The heads are received in the two sliding grooves, and the main bodies are located outside the sliding grooves, respectively. To connect the first housing and the second housing together, the second housing is moved to cause the movable member to totally pass through the slot, the movable member is rotated from a vertical orientation to a substantially horizontal orientation and rests on the second housing.