The invention provides a wine output structure of a plastic wine bucket, and belongs to the technical field of wine output structures of plastic wine buckets. The technical problems that an existing wine bucket is inconvenient to mount, and poor in wine output stability are solved. The plastic wine bucket comprises a bucket body, a wine spearhead and a guide sleeve are fixedly connected to a bucket opening of the bucket body, the guide sleeve is located in the wine spearhead, a joint with two through ends is connected in the guide sleeve, the lower end of the joint is connected with a flexible bag, and the wine output structure comprises a pressing cap and a valve element; and the valve element is arranged in the joint and can vertically move, the pressing cap is located at the lower end of the joint, an elastic part capable of enabling the valve element to act on the joint and forming seal with the joint is arranged between the valve element and the pressing cap, the pressing cap is detachably connected with the joint, and a wine passing hole is formed in the pressing cap. The structure has the beneficial effects of being convenient to mount and good in wine output effect.