The invention discloses a resonant three-point-bending high-temperature fatigue testing machine. The machine is characterized in that a dynamic loading motion component is formed by mutually connecting a lower clamp, a driving rod, a power sensor, a static force sensor, a vibration exciting rod and a vibration exciter, wherein in order to enable the dynamic loading motion component to keep an axial single-freedom-degree motion, the dynamic loading motion component is transversely restricted on a main frame by utilization of a lower motion positioning spring sheet and an upper motion positioning spring sheet, and is only allowed to move up and down; a rigidity-adjustable spring is additionally arranged between the dynamic loading motion component and the main frame, so that a higher resonant frequency is obtained; an upper clamp is fixed on a static loading regulating device; a heating furnace is positioned on a heating furnace bracket; the main frame is fixed on a base; the heating furnace bracket and the base are placed on the ground. The high-temperature fatigue testing machine disclosed by the invention has the advantages that the resonant fatigue testing machine which can meet a high temperature environment is obtained through an integrated design of a fatigue testing machine and a high-temperature clamp, and therefore not only is the high-temperature environment requirement met, but also high-efficiency experiment requirements are met.