The invention discloses a super-critical water fine particle motion observation and experiment device. The super-critical water fine particle motion observation and experiment device comprises a pressure container, a probe (5), a protective layer (3), a booster pump (1) and a heating plate (6), wherein the pressure container is made of a pressure container outer wall (4) and filled with water containing particle matter; the X ray emitted by the probe (5) penetrates through the pressure container outer wall (4), and the probe (5) records and collects the motion condition of the particle matterin the pressure container in the format of pictures; the protective layer (3) is used for preventing ray radiation of the probe (5) and improving the structural strength of the pressure container outer wall (4); the booster pump (1) pressurizes and injects the water containing the particle water into the pressure container; the heating plate (6) is fixedly arranged at the bottom end of the pressure container and used for heating the water containing the particle matter in the pressure container. The device is high in compression strength, a user can visually and clearly research motion deposition change of the particle matter in the super-critical in a visual format, and the research result is high in reliability.