The invention relates to an accelerated aging test device for an arrester valve plate based on a direct current-coupled impact power supply, which comprises a direct current voltage generator, an impact current generator and a signal monitoring device. The impact current generator and the direct current voltage generator are connected with the signal monitoring device; the output terminal of the direct current voltage generator is divided into two paths, one of which is connected with one end of a current-limiting inductor, and the other of which is connected with one end of a resistor divider; the other end of the current-limiting inductor is divided into two paths, one of which is connected with the test valve plate, and the other of which is connected with one end of a isolating capacitor; the other end of the isolating capacitor is divided into two paths, one of which is connected with the impact current generator, and the other of which is connected with a capacitor divider. The accelerated aging test device adopts the power supply of coupling the direct current voltage generator and the impact current generator in parallel as excitation for accelerated aging of the arrester valve plate, so that the test condition of a test piece is closer to the actual operating condition; the accelerated aging test device can be used for researching the V-A characteristic, the aging characteristic and the direct current impact coupling operating characteristic of the direct current arrester valve plate under the effect of the direct current and the impact high voltage.