The invention relates to an auxiliary pineapple harvester. The auxiliary pineapple harvester comprises a moving cart body, a gathering mechanism, a cutting mechanism, a conveying channel, a collectionbox and a transmission system, wherein the gathering mechanism, the cutting mechanism, the conveying channel and the transmission system are fixed to a rack of the moving cart body; the gathering mechanism is located on the front portion of the moving cart body; the conveying channel is formed above an upper saw web in the cutting mechanism. After a to-be-picked pineapple plant is gathered through the gathering mechanism, a pineapple enters the conveying channel and is cut by the upper saw web from the pineapple plant, and the pineapple which is cut off is pushed into the collection box through the conveying channel. According to the auxiliary pineapple harvester, an integrated cart design is adopted, when the harvester arrives at the pineapple position, through mutual cooperation of thegathering mechanism, the cutting mechanism, the conveying channel and the collection box, the harvester performs actions of automatic picking and collection, the pineapple picking efficiency is high,the defects that manual picking is low in efficiency and high in cost are overcome, and the aims of reducing human and material resources are achieved.