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The utility model relates to hydraulic impact hammer technical field especially relates to a kind of hydraulic hammer with built-in piston accumulator, including cylinder body and oil inlet channel and oil return channel.The first energy storage mechanism, the first energy storage mechanism includes first chamber and the first sealing assembly reciprocatingly slidably arranged along the central axis direction of first chamber;First sealing assembly divides first chamber into first hydraulic oil chamber and first nitrogen chamber independent of each other, and first hydraulic oil chamber is communicated with oil inlet channel;Second energy storage mechanism, second energy storage mechanism includes second chamber and the second sealing assembly reciprocatingly slidably arranged along the central axis direction of second chamber;Second sealing assembly divides first chamber into second hydraulic oil chamber and second nitrogen chamber independent of each other, and second hydraulic oil chamber is communicated with oil return channel, and first chamber is not communicated with second chamber.The utility model solves the problem that hydraulic oil produces water hammer effect in hydraulic oil pipeline when hydraulic hammer works, causes unstable hydraulic system, and low service life problem by built-in piston accumulator.