The utility model discloses a flywheel assembly of an engine crankshaft of an automobile. The flywheel assembly of the engine crankshaft of the automobile mainly comprises a crankshaft, a flywheel assembly body, a damping belt pulley assembly, a chain wheel group and a signal panel, wherein a front end shaft, the chain wheel group, a connecting sleeve subassembly, the damping belt pulley assembly, a bolt assembly and a positioning mechanism are arranged at the front end of the crankshaft; the chain wheel group and the connecting sleeve subassembly are sequentially sleeved on the front end shaft; a pillow block is arranged at the tail end of the front end shaft; the chain wheel group is connected with an end surface of the pillow block through the positioning mechanism; a shaft hole with threads is formed in an end surface of the front end shaft; and the chain wheel group, the connecting sleeve subassembly and the damping belt pulley subassembly are connected with the front end shaft to form a whole body through the bolt subassembly. By using the flywheel assembly of the engine crankshaft of the automobile, the problem that the flywheel assembly of the crankshaft is complicated in structure, weak in structural strength and insufficient in torque transmission is solved; the structure of the chain wheel group is optimized; eccentric wear phenomena are reduced; the structure of the front end of the crankshaft is arranged reasonably; and the reliability is improved.