The invention discloses a convenient low-energy bullet. The convenient low-energy bullet comprises a grinding box body, wherein a first grinding device, a second grinding device, a powder collecting device, a blocking door part and an illuminating device are arranged in the grinding box body; the first grinding device comprises a first transmission cavity; the left side of the transmission cavityis equipped with a second transmission cavity; a hydraulic cylinder is fixedly mounted in the inner wall of the left side of the second transmission cavity; the right side end surface of a piston pushing rod at the right side of the hydraulic cylinder is fixedly equipped with an L-shaped pressure plate; a rack is arranged below the rear side end surface of the L-shaped pressure plate; a first rotary shaft is rotatably mounted in the bottom wall of the second transmission cavity in a matched mode; a first gear is fixedly mounted on the first rotary shaft; the first gear is engaged with a rack at the rear side of the L-shaped pressure plate; a second rotary shaft is rotatably mounted in a position, at the right side of the first rotary shaft, in the bottom wall of the second transmission cavity in the matched mode; and a second gear is fixedly mounted on the second rotary shaft.