The utility model relates to a chain link hook component of a chain transmission device, particularly to a chain link hook component. In the prior art, chain transmission is adopted by a round ring chain bucket elevator, namely a closed loop chain is formed by the connection of a plurality of chain link units with a hopper, and then the hopper for hoisting materials is fixed on a hopper hook. Owing to the poor industrial and mining condition of the hopper hook, the hook bears not only the stress of a pulling force but also the weight of the hopper and the hoisted materials when the elevator is in operation, thus the abrasion, fracture, and failure of the hopper hook can be easily caused in a condition that the transmission mechanism operates in a long term. In the utility model, the chain link hook body and a lock block are clamped on a straight arm of a certain chain link; a connecting bolt passes through the chain link hook body from the front and is screwed and tightened with a bolt hole at the middle of the lock block as a whole through a locking nut. As the chain link hook component is installed on a certain chain link of a long chain so as to only bear the weight of the hopper and the hoisted materials, not the pulling force, thereby prolonging the service life of the chain transmission system in duplication.