The invention discloses a multifunctional laser fusion diagnostic interferometer, which comprises a lighting lens, a beam splitter 1, a beam splitter 2, an imaging lens 1, an imaging lens 2, an imaging lens 3, a streak camera 1, a streak camera 2, a streak camera 3, an optical circulator module, a probe optical image transmitting module, an interference module 1 and an interference module 2. The multifunctional laser fusion diagnostic interferometer provided by the invention has the advantages of novel structure and easy implementation, can share a light receiving optical path of a traditional linear VISAR, reserves an interference measurement shock wave velocity module of the traditional linear VISAR, fully utilizes probe laser by means of an improved optical path, tracks probe light absorption intensity and shock wave interference verification while acquiring interference beat frequency to calculate a shock wave surface velocity, cooperates with the appropriate image processing means, can acquire more pieces of state-of-matter information, and is conductive to carry out further state-of-matter diagnostic research.