The invention relates to a fruit and vegetable fresh-keeping packaging bag capable of self-adjusting moisture and a producing method thereof. The fruit and vegetable fresh-keeping packaging bag comprises a bag body, wherein an object loading area is arranged on the upper part of the bag body, a water storage area is arranged on the lower part of the bag body, and a fence transition area is arranged between the object loading area and the water storage area; the fence transition area comprises a plurality of water vapor channels which communicate the object loading area with the water storage area and exchange fences which are used for spacing every two adjacent water vapor channels; and the contact angle [theta]a of a membrane material on the inner wall surface of the object storage area is larger than the contact angle [theta]b of a membrane material on the inner wall surface of the fence transition area or the water vapor channels, and the contact angle [theta]c of a membrane material on the inner wall surface of the water storage area is smaller than the contact angle [theta]b. When fruits and vegetables are stored in the fruit and vegetable fresh-keeping packaging bag, the self-adjusting function of humidity in the bag is realized. Compared with common anti-fog fresh-keeping bags, the anti-fog performance is increased by more than 30%, the problem of rotting caused by accumulated water on the lower part of a vegetable area can be solved, the freshness of the fruits and vegetables is effectively improved, and the shelf life of the fruits and vegetables is prolonged.