A server cabinet includes a housing and a power distribution unit (PDU). The housing includes a bottom plate defining two first holes, and a top plate defining two second holes. The PDU includes a main body, a top base, a motion member, a resilient member, and a handle. Two first pins protrude down from the main body to be inserted into the first holes. The top base is fastened to the main body. A top of the top base defines two through holes. The motion member is movably received in the top base, and forms two second pins. The resilient member is connected between the main body and the motion member, to bias the motion member to move up, thereby allowing the second pins to extend out of the corresponding through holes and be inserted into the second holes. The handle is attached to the motion member.