A valve connector has a tubular body, a connection head, and an annular seal. The tubular body has at least one air inlet, an air outlet, and a first threaded hole. The first threaded hole is defined in the tubular body, communicates with the air outlet, and has a first thread specification and an inner diameter. The connection head is mounted detachably on the tubular body and has a second threaded hole and a recess. The second threaded hole has a second thread specification and an inner diameter larger than that of the first threaded hole. The recess is axially defined in the connection head and has an inner diameter larger than that of the second threaded hole. The annular seal is mounted in the recess in the connection head and is clamped between the tubular body and the connection head.