The present invention relates to an automatic lifting device for a laver bed and, specifically, to an automatic lifting device for a laver bed, capable of preventing a cylinder member from being damaged by enabling a cylinder rod to straightly reciprocate without vertical shaking when the cylinder rod moves forward and backward and of performing effective laver bed lifting work even if the size of the cylinder member becomes small by transferring forward and backward moving energy of the cylinder rod to be transferred to a laver bed hanging unit holder without an energy loss by a rack and pinion gear. According to the present invention, the automatic lifting device for a laver bed comprises: a base plate (100) fixed to a vessel and having a pair of guide rails (110) installed on one side in a longitudinal direction by being spaced at fixed intervals, wherein the base plate (100) has a long guide hole (120) between the guide rails (110)； the cylinder member (200) installed on the upper surface of the base plate (100) by a fixing bracket (130) for the cylinder rod (220) to move forward and backward between the guide rails (110)； the rack gear (300) installed in the guide rail (110) to reciprocate while being connected to the cylinder rod (220)； the laver bed hanging unit holder (400) installed by the pinion gear (310) connected to the rack gear (300) and rotating through the long guide hole (120) toward the lower part of the base plate (100) when the rack gear (300) reciprocates or rotates to the upper part of the base plate (100)； and a base cover (500) mounted on the upper surface of the base plate (100) to close the cylinder member (200).본 발명은 김발 자동인양장치에 관한 것으로, 보다 상세하게는 실린더로드의 진퇴시 상하흔들림 없이 직진 왕복이동될 수 있도록 하여 실린더부재의 손상을 방지함은 물론 실린더로드의 진퇴에너지가 랙기어 및 피니언기어에 의해 에너지 손실없이 김발걸이구꽂이대에 전달될 수 있도록 하여 실린더부재의 크기가 작아지더라도 효과적인 김발인양작업을 수행할 수 있도록 하는 김발 자동인양장치에 관한 것이다. 본 발명은 선박에 고정되게 설치되되 일측에 상호 일정간격 이격된 상태로 길이방향을 따라 한 쌍의 가이드레일(110)이 설치되고, 상기 가이드레일(110) 사이에 가이드장공(120)이 형성된 베이스플레이트(1
