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).
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