The invention discloses a crack filling material performance testing device which comprises a workbench, a connecting rod, a semicircular sliding chute, two sets of fixtures, a piece to be tested, placement grooves for the piece to be tested, cushion blocks and two telescopic rods, wherein the fixtures are arranged on the workbench; the connecting rod of the right-side fixture is connected with a power device for driving the fixtures of the piece to be tested to horizontally slide leftwards and rightwards on the semicircular sliding chute; the left-side fixture is connected through a fixed shaft on the left side, and is fixed on one side of an instrument container body; the two telescopic rods are arranged below the right-side fixture, are positioned on the two sides of the semicircular sliding chute respectively, are fixed on the workbench, and extend and retract in opposite directions when acting. The testing device is used for testing the bonding performance and fatigue resistance of a crack repairing material under the reciprocal action of a dynamic load.