The invention provides a high-temperature high-pressure multifunctional dynamic evaluation experimental apparatus of drilling fluid, mainly comprising a boosting pump, an experimental tank, a condenser, an electromagnetic valve, a material storage tank, a filter liquor measuring cylinder, a pulp receiving tank, a sensor, a computer and a time controller, wherein the experimental tank mainly comprises a tank body, a magnetic transmission system, a thermowell, a boosting hole joint, a liquid adding hole joint, a slurry cup, a stirring shaft and a stirring cylinder. The invention has the advantages of simple, convenient and easy operation, enhanced work efficiency, real simulation of an actual underground working condition, higher safety, more stable apparatus and longer service life and alsoforms a high-temperature high-pressure multifunctional dynamic evaluation experimental technique.