A locking structure applied to lock a first housing of a server cabinet to a second housing includes a main body, a control portion, a driving portion, and a hand-held portion. The main body is positioned at the first housing. The control portion is positioned inside the main body. One end of the driving portion is rotatably mounted to the control portion. One end of the hand-held portion is rotatably connected to the main body and other end of the driving portion. When the other end of the hand-held portion is operated, the hand-held portion moves towards the main body, and the driving portion moves the control portion, thereby driving the first housing to move towards the second housing.