The invention relates to a crankshaft shock absorber and an automobile. The crankshaft shock absorber comprises a first rotation piece, a second rotation piece and a plurality of bolts. The first rotation piece and the second rotation piece are coaxially arranged. The second rotation piece is located on the right side of the first rotation piece, and the second rotation piece is provided with a plurality of bolt holes with leftward openings, wherein the bolt holes correspond to the multiple bolts in a one-to-one manner. The multiple bolt holes are evenly distributed in the circumferential direction of the second rotation piece. The first rotation piece is provided with via holes corresponding to the bolt holes in a one-to-one manner. A cone-barrel-shaped first damping pad is arranged between each bolt and the first rotation piece, the diameters of the first damping pads are gradually reduced from left to right, the first rotation piece is provided with first inner conical faces matchedwith the outer side walls of the first damping pads, and the bolts are provided with first outer conical faces matched with the inner side walls of the first damping pads. One of the first rotation piece and the second rotation piece is a hub, and the other one of the first rotation piece and the second rotation piece is a mass block. According to the crankshaft shock absorber and the automobile,the crankshaft shock absorber assembling difficulty is lowered, and the service life of the crankshaft shock absorber is prolonged.