The present invention pertains to a reinforcement bar coupler. More specifically, the reinforcement bar coupler includes: a female thread having an inclined tapered surface on the inside surface of a coupler cap; and a fastening spring to be inserted and coupled with the female thread, wherein the fastening spring increases in diameter thereof while contacting the root of the female thread so that a reinforcement bar may slip in the case that the reinforcement bar is inserted inside, and decreases in diameter while moving along the inclined tapered surface so that the reinforcement bar may be restrained in the case that an external force is applied thereto in the opposite direction of insertion in the state that the reinforcement bar is inserted. The reinforcement bar coupler may simply connect and fix a reinforcement bar in a one-touch manner using the change in diameter due to the torsion of the fastening spring with a relatively simple configuration.
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