The invention discloses a water surface garbage cleaning device with double-boat cooperation and an operation method. The device includes two unmanned pushing-net operation boats and a water surface garbage collection pushing net; the water surface garbage collection pushing net is connected between the two unmanned pushing-net operation boats; and the water surface garbage collection pushing netincludes floating ball groups, gravity pendant groups, a cod-end, a hack lever, upper connection rods, supporting rods, an upper fishing net dedicated rope, a middle fishing net dedicated rope, a lower fishing net dedicated rope, a pulling ring, a metal plate, a button, springs, fishing nets and lower aluminium alloy rods. According to the water surface garbage cleaning device, during the operation of the water surface garbage cleaning device with double-boat cooperation, the distance between the two unmanned pushing-net operation boats can be adjusted according to the width of the water surface; and in a particularly narrow water area, the operation can be conducted through a front-rear arrangement mode, so the water surface garbage cleaning device with double-boat cooperation can flexibly conduct operation in water surface with various widths and the cleaning efficiency of water surface garbage is improved.