The present invention relates to a support device of a laver farming net, comprising: a holding bar molded by a synthetic resin material to support a laver farming net; a buoy combined with the holding bar to provide buoyancy to the holding bar; and a fastening member mutually fastening the buoy and the holding bar. The buoy comprises a buoyant body capable of floating on the water, and a combination part formed in the buoyant body to be combined with the holding bar. The combination part comprises: a first support wall having a first locking groove to lock one side of the combination member; a second support wall formed to face the first support wall and having a second locking groove to lock the other side of the fastening member; a reception part having an insertion formed in a position lower than that of the first and second support walls between the first and second support walls to include an insertion hole into which the holding bar is inserted between the first and second support walls; and a penetrating insertion hole penetrated along a direction from the first support wall to the second support wall to be inserted by the fastening member. Moreover, the holding bar is received in the fastening member of the buoy to fasten the fastening member to the combination part in order to be locked in the locking groove formed in the holding bar, so fastening force can be increased. Moreover, since the holding bar formed by the synthetic resin to include a hollow part is used, an advantage capable of preventing the holding bar from being damaged is provided.본 발명은 김 양식용 그물망 지지장치에 관한 것으로서, 김 양식용 그물을 지지하기 위해 합성수지 소재로 성형된 거치대와, 상기 거치대와 결합되어 상기 거치대에 부력을 제공하는 부자와, 상기 부자와 상기 거치대를 상호 결속하는 결속부재;를 구비하고, 상기 부자는 수면에 부유할 수 있는 부력체와, 상기 부력체에 형성되어 상기 거치대와 결합하는 결합부를 구비하고, 상기 결합부는 상기 결속부재의 일측이 걸리도록 제1 걸림홈이 형성되는 제1 지지벽과, 상기 제1 지지벽과 마주보게 형성되고 상기 결속부재의 타측이 걸리도록 제2 걸림홈이 형성되는 제2 지지벽과, 상기 제1 및 제2 지지벽 사이에서 상기 제1 및 제2 지지벽보다 낮게 형성되어 상기 제1 지지벽과 상기 제2 지지벽 사이에 상기 거치대가 삽입되는 삽입공간을 형성하는 안착부와, 상기 제1 지