An automatic substrate laying machine for elevated cultivation relating to the field of agricultural equipment.The invention comprises: a moving cart (3), a substrate loader and a substrate box (6), a feeder, a bifurcated movable supported substrate dropping device, and a substrate dispenser. The substrate box (6) is installed on top of the moving cart (3). The substrate loader is installed on a rear side of the substrate box (6), the feeder is installed within the substrate box (6), and the bifurcated movable supported substrate dropping device is installed at the front portion of the substrate box (6). The substrate dispenser is installed at outlet openings at two bottom sides of the bifurcated movable supported substrate dropping device. The automatic dispensing machine addresses in the problem of push and pull movements occurring when automatically switching between a loading position and a resting position, moving a substrate within a box during a loading process and a feeding process, and automatic adaptation to a construction offset of an elevated system, and combines multiple steps of substrate laying for elevated cultivation into a combined operation performed by a single machine. The invention has excellent adaptability to an elevated cultivation bed and the substrate, is easy to operate, reduces labor requirements, and is reliable.Linvention concerne une machine de pose de substrat automatique destinée à la culture surélevée se rapportant au domaine des équipements agricoles. Linvention comprend : un chariot mobile (3), un chargeur de substrats et un boîtier de substrat (6), un dispositif dalimentation, un dispositif de dépôt de substrat monté mobile, et un distributeur de substrat. Le boîtier de substrat (6) est placé sur le dessus du chariot mobile (3). Le chargeur de substrats est placé sur un côté arrière du boîtier de substrat (6), le dispositif dalimentation est placé dans le boîtier de substrat (6), et le dispositif de dépôt de substrat monté mobil
