The utility model provides a sample fixture device for thermal shock test of thermal barrier coating gradient, is including the circular steel sheet in the bottom that the external diameter is the same, middle ring and the top ring of stack use in proper order, before the experiment, earlier arrange the circular steel sheet in bottom in bottom, on it was arranged in to middle ring, the ring is trapezoidal in the middle of putting into the sample thereupon held between the claw, arrange the top ring in it at last on, adjust three part to the round hole on it and align, through bolted connection, the nut fastening, the sample assembly is accomplished, the utility model discloses characteristics are anchor clamps simple structure, and simple to operate raises the efficiency, anchor clamps do not influence thermal shock test in -process the sample surface stress state, can truly simulate the surface state that covers thermal barrier coating work piece during operation, can satisfy sample surface heating, back refrigerated condition, simulation thermal barrier coating is the condition of being on active service truly.