Provided is a lifting device adapted a plant factory including a shelf, a first supporting bar, a second supporting bar, first fixing rings, second fixing rings, and a drive device. The shelf includes a cultivation layer and a lighting device. The lighting device is disposed on the cultivation layer. The first supporting bar is used to provide a nutrient solution into the cultivation layer. The second supporting bar is used to exclude excess of the nutrient solution in the cultivation layer. The first fixing rings are used to define a position of the lighting devices. The second fixing rings are used to define a position of the cultivation layers. The drive device connects with the first supporting bar, and is used to drive the shelf to lift along the first supporting bar.一種用於植物工廠的升降裝置包括:層架、第一支撐桿、第二支撐桿、多個第一固定環、多個第二固定環以及驅動裝置。層架具有多個栽培區。每一栽培區包括栽培層以及照明裝置。照明裝置配置於所述栽培層的上方。第一支撐桿用以提供養液至所述栽培層中。第二支撐桿用以排除所述栽培層中的多餘所述養液。第一固定環用以限定所述照明裝置的位置。第二固定環用以限定所述栽培層的位置。驅動裝置連接所述第一支撐桿,用以驅動所述層架沿著所述第一支撐桿升降。10‧‧‧升降裝置100‧‧‧層架102‧‧‧栽培區104‧‧‧栽培層106‧‧‧照明裝置108‧‧‧第一支撐桿108a‧‧‧第一內管108b‧‧‧第一外管110‧‧‧第二支撐桿110a‧‧‧第二內管110b‧‧‧第二外管112‧‧‧第一固定環114‧‧‧第二固定環116‧‧‧驅動裝置118‧‧‧供給裝置120‧‧‧養液桶122‧‧‧幫浦200‧‧‧部分D1‧‧‧第一方向d‧‧‧距離S1‧‧‧第一側S2‧‧‧第二側T‧‧‧厚度
