The invention discloses a ship-belt type fouling removing device. The ship-belt type fouling removing device comprises a bearing unit, a removing unit, an absorbing unit and a driving unit. The bearing unit comprises two linear rails. The absorbing unit comprises two same moving parts, and the two same moving parts are correspondingly fixed at the two ends of each linear rail, and fixed on the ship outer broadsides through electromagnetic force and can move on the ship outer broadsides. The removing unit comprises a multi-grade steel brush, a guide rail sliding device and a driving motor. The guide rail sliding device is placed on the two linear rails and moves along the rails. The multi-grade steel brush is placed on the guide rail sliding device. The guide rail sliding device reciprocates along the rails under driving of the driving motor and drives the multi-grade steel brush to remove fouling. The driving unit comprises four propellers and eight reverse wheels. Two of the four propellers are correspondingly fixed on the absorbing unit. The other two propellers of the four propellers are correspondingly fixed on the two sides of the each linear rail. The propellers are driven by a small waterproof motor, and the eight reverse wheels are fixed below the absorbing unit and the linear rails.