The invention discloses a mixed-reality MR landscape fountain or MR waterfall system, and belongs to the technical filed of display technologies, MR technologies and HR technologies. The mixed-reality MR landscape fountain or MR waterfall system comprises a relief surface-display display screen, a water spraying system, a quenching system, a remote sensing system, a content system and a real sight landscape, wherein the content system is connected with the relief surface-display display screen; the remote sensing system is connected with the water spraying system and the quenching system; the relief surface-display display screen, the water spraying system and the quenching system are mounted in the real sight landscape; and the remote sensing system is mounted in the position suitable for sensing outside the real sight landscape. The mixed-reality MR landscape fountain or MR waterfall system has the advantages that ornamental value of the landscape fountain is increased, the foundation is endowed with more contents, external expression forms and magic effects, teaching is carried out through lively activities, people can know power of science and technology while feeling curious and shocked, and a science popularization function is achieved.