A transferring device includes a conveyer system, a reloading mechanism, and a jig. The reloading mechanism includes a blocking assembly and a grasping assembly. The blocking assembly includes a holding member mounted on the conveyer system, a stopping member, and a first driving member positioned on the holding member. The stopping member is connected to the first driving member. The grasping assembly includes a fixing member mounted on the conveyer system, a second driving member mounted on the fixing member, a third driving member mounted on the second driving member, and a pair of catches. The catches are positioned at opposite ends of the third driving member. The jig includes a top cover and a bottom cover engaged with the top cover. The jig is transferred on the conveyor system.