The invention provides a large-scale water surface garbage treatment device. The large-scale water surface garbage treatment device comprises a base, four first turbine parts, two fishing parts, threesecond turbine parts and a garbage storage tank, and is characterized in that four first turbine part fixing seats of the four first turbine parts are fixedly mounted on motor shafts of four first steering engines correspondingly; four first arc grooves are slidably mounted on four sets of rolling balls correspondingly; four sliding blocks of the two fishing parts are slidably mounted in four first dovetail grooves correspondingly; two second gears are engaged with two first racks correspondingly; the upper portion of the garbage storage tank is fixedly mounted in a first groove; two garbagepressing blocks are driven to crush floating garbage through two first stepping motors; two hydraulic cylinders stretch to drive a pressing plate to press the garbage into the garbage storage tank. Through the large-scale water surface garbage treatment device, the garbage is crushed, the internal space utilization rate of the garbage storage tank is increased, and the garbage storage efficiency is improved.