The present invention relates a one-direction ratchet wrench, which has a driving head with a first cavity and a second cavity. There are walls located on the top and the bottom portions of the second cavity, and a pin hole is extended from the second cavity to the walls. A ratchet wheel is rotatably mounted in the first cavity, and there is a plurality of ratchet teeth in the outer periphery of the ratchet wheel and a receptacle formed in the middle to receive and drive workpieces. A pawl is located in the second cavity and one of its sides has a plurality of teeth engaged with the ratchet teeth. A pin is inserted in a pin hole for an elastic assembly to hitch on. The elastic assembly has a first elastic element and a second elastic element. One end of the second elastic element links to the pawl and the other end links to the first elastic element. The first elastic element hitches on the pin and one of its ends sticks against the inner wall of the second cavity. Thus, the present invention is able to effectively control workpieces being driven in one-direction.