To provide an air recycling system capable of coping with size reduction of a plant cultivation scale and surely generating an air flow due to pressure difference between adjacent spaces, and a plant cultivation device comprising the system.SOLUTION: An air recycling system comprises: partition walls 10, 11 for partitioning a cultivation chamber 1； and air compression means 30 provided on the partition wall and generating pressure difference between an air suction space 2 and air supply spaces 3, 4, the cultivation chamber has a basic unit for arranging the air supply space on each of both sides of a longitudinal direction of the air suction space. A cultivation shelf 20 has a main exhaust port 21 capable of discharging air flowed from an opening 22 to outside of the cultivation shelf in a halfway. The air flow flowed from the air supply space to the air suction space is formed on a shelf by pressure difference, and part or all of the air discharged from the main exhaust port to the air suction space is sucked by air compression means for recycling air. A plant cultivation device is provided.SELECTED DRAWING: Figure 1【課題】植物栽培規模の大型化にも対応して、隣り合う空間内の圧力差による空気流を確実に生成できる空気還流システムおよび当該システムを備える植物栽培装置を提供する。【解決手段】栽培室１を仕切る隔壁１０，１１と、隔壁に設けられて空気吸引空間２と空気供給空間３，４との間に圧力差を生じさせる空気圧縮手段３０等とを含み、栽培室は空気吸引空間の長手方向両側に空気供給空間を配置する基本ユニットを有し、栽培棚２０は、開口部２２から流れてくる空気を途中で栽培棚の外に排気可能な主排気口２１を備え、圧力差により空気供給空間から空気吸引空間へ流れる空気流を棚上に形成させ、主排気口から空気吸引空間に排気された空気の一部または全部を空気圧縮手段等によって吸引して空気を還流させる空気還流システム、および植物栽培装置に関する。【選択図】図１
