The invention relates to the technical field of agricultural machinery, and discloses a harvester for rotten vegetable leaves in fields. The harvester for rotten vegetable leaves in fields includes achassis, a collecting device, a conveying belt, a crusher, a screw press, a material collecting box and a juice collecting box. During the operation, with the advancing of the chassis, two groups of V-shaped vegetable-gathering wheels collect the rotten vegetable leaves within a harvesting breadth into a picking width, an elastic tooth type picker continuously rotates to pick the rotten vegetableleaves into a screw auger on a collecting table, the screw auger further collects the rotten vegetable leaves to the conveying belt, the conveying belt conveys the rotten vegetable leaves into a feeding port of the crusher, the rotten vegetable leaves crushed by the crusher enter the screw press for pressing and dewatering, the predetermined dehydration rate of the rotten vegetable leaves is finished, the dehydrated rotten vegetable leaves are pushed out by a pressing discharging port to the material collecting box for temporary storage, vegetable juice enters the juice collecting box for storage, combined operation of continuous collection of the rotten vegetable leaves, picking, crushing, squeezing and dewatering and temporary storage. The harvester is applied to the harvesting of the rotten vegetable leaves in various vegetable planting bases throughout China, and after being squeezed and dewatered, the rotten vegetable leaves can serve as feed or fertilizer for recycling.