The invention discloses a three-dimensional simulation method for exploiting a super-heavy oil reservoir through an FUSE technology. The method is implemented under the true triaxial loading conditionand comprises the following steps of target stratum simulation, stress loading, hydraulic expansion, steam circulating process simulation and heavy oil extracting and exploiting process simulation. Asimilar material and natural oil sand are adopted to simulate the stratum, stress loading is conducted to restore the true reservoir stratum stress environment, and oil sand reservoir stratum hydraulic expansion is conducted through a high-pressure water pump and a pre-buried stainless steel pipe; temperature data of different time and stratum positions are collected through a temperature sensor;the communication performance of double horizontal wells and the developing situation of the expansion area are detected; then, high-temperature steam injection circulation operation is conducted through a steam generator, temperature data are collected through a temperature sensor, and real-time monitoring of steam cavity expanding is achieved; and after the reservoir stratum temperature reachesthe transferring temperature, heavy oil exploiting is conducted through an external negative-pressure extracting exploiting system. The three-dimensional simulation method provides an effective testing measure and method for studying the mechanism of exploiting the super-heavy oil reservoir through the FUSE technology.