The invention discloses a processing technology for green and environment-friendly vegetable tanning top layer leather. According to the processing technology, the green and environment-friendly vegetable tanning top layer leather is prepared by carrying out water soaking, fleshing, depilation, vegetable tanning, detanning, leather bleaching, stuffing and drying treatment, wherein in the drying step, the top layer leather is dried by a drying machine, the drying machine comprises a drying cylinder, a drying tray, a drying motor, a drying rotating shaft, a clamping shaft, a first air drying part and a second air drying part, the drying motor is arranged on the lower surface of the drying tray, the drying rotating shaft is arranged on the drying tray, the drying motor drives the drying rotating shaft to rotate, the drying cylinder abuts against the upper surface of the drying tray, a plurality of limiting blocks are arranged on the inner peripheral surface of the drying cylinder, the clamping shaft is used for clamping one side of the top layer leather, and the first air drying part and the second air drying part sleeve the clamping shaft and are coordinated with the limiting blocksto clamp the other side of the top layer leather and meanwhile perform air drying on the top layer leather. Compared with the prior art, the production efficiency is greatly improved.