Two-way shock accelerator

The utility model discloses a two-way shock accelerator comprising a mandrel (1), a spline body (2), an upper cylinder sleeve (3), an upper mandrel (4), a connecting body (5), an upper piston (6), a hydraulic cylinder (7), a washing pipe (8), a lower piston (9), a balance washer (10), a terminal pressure cap (11) and a lower connector (12) which are sequentially connected from up to down. A downward acceleration function is added based on a one-way accelerator, so that the accelerator can not only realize upward acceleration but also can realize downward acceleration, and the efficiency of solving a sticking accident during a well drilling process is improved. In addition, the two-way shock accelerator ingeniously makes use of the double-piston structure which not only can move but also can be fixed, so that the same oil chamber is shared in the energy storage when a tool is accelerated upwards and downwards, the total length of the tool is shortened, the cost is reduced, and the transportation is facilitated