The invention provides a changeable virtual valve. The changeable virtual valve comprises an outer sleeve, an inner sleeve, a first flange, a second flange and a fastener, wherein the first end of theouter sleeve is in threaded connection with the first flange, a strip-shaped first gap is formed in the second end of the outer sleeve, the first gap is axially formed along the outer sleeve, the first end of the inner sleeve is in threaded connection with the second flange, a second gap which corresponds to the first gap is formed in the second end of the inner sleeve, the inside diameter of theouter sleeve is greater than the outside diameter of the inner sleeve, the second end of the inner sleeve is inserted into the outer sleeve from the second end of the outer sleeve, the first gap andthe second gap are aligned, and the fastener passes through the first gap and the second gap so as to fixedly connect the outer sleeve and the inner sleeve. The virtual valve has the advantages of simple structure, attractive appearance and capability of reuse, the length can be adjusted, the flanges can be replaced, and different specifications of valves can be replaced so as to be connected witha system pipeline.