Disclosed is a method for controlling unidirectional link connection in a mobile ad hoc network which comprises: mobile nodes including transmission power information in a beacon message that is periodically transmitted; using the information to sense a unidirectional link and maintain residual power information with regard to the corresponding node, and providing unidirectional link connectivity in the link layer to an upper layer through a filtering process using broadcasting and residual power information. Hence, the unidirectional links generated in the mobile ad hoc network may be accurately sensed using transmission power loss on a transmission path, and the frames generated in the link layer in the reverse direction of the unidirectional links may be transmitted.