The invention relates to a soft-frame abalone breeding device, belonging to the aquaculture device field. The soft-frame abalone breeding device is equipped with a soft frame and a net body, wherein, the soft frame consists of a heald cord, a fixed rope, an anchor and a buoy, the anchor is sunk into the bottom of the sea, the heald cord is connected with the anchor through the fixed rope, the buoy is bound on the heald cord, and the heald cord floats on the sea; and the net body is of a box structure formed by a net with an upper opening, a tied rope is fixed at an edge of the upper opening of the net body, the other end of the tied rope is tied on the heald cord of the soft frame, and adherence substrates composed of a plurality of crossed vertical plates are fixed in the net body. The soft frame of the invention can overcome the danger of wind waves and improve the production safety; and mechanical bait casting can be adopted, thus obviously lowering the labor intensity and enhancing the labor efficiency. The soft-frame abalone breeding device has simple structure and low manufacturing cost.