The invention discloses a fully-rigid true triaxial system for rocks and a deep rock temperature stress coupling simulation system, relating to the field of geotechnical engineering. The fully-rigid true triaxial system comprises a rigid true triaxial system and a temperature control system, wherein the rigid true triaxial system comprises a first loading shaft, a second loading shaft and a thirdloading shaft which are vertical two by two; a driving system is connected to the first loading shaft, the second loading shaft and the third loading shaft respectively to drive the first loading shaft, the second loading shaft and the third loading shaft to respectively move along the extension directions so as to extrude test samples; and the temperature control system is fit to the test samplesand is used for heating the test samples. The deep rock temperature stress coupling simulation system adopts the fully-rigid true triaxial system for the rocks. According to the fully-rigid true triaxial system for the rocks and the deep rock temperature stress coupling simulation system, a stress path simulation experiment can be realized in a high temperature environment of 800 DEG C.