Marine floating garbage classified collection device and collection method

The marine floating garbage classified collection device comprises a frame body, floating barrels are arranged on the two sides of the frame body, a folding opening is formed in the front side of the frame body, a collection box with a plurality of separated storage areas is arranged in the middle of the frame body, a garbage classification mechanism is arranged at the upper end of the frame body, and the garbage classification mechanism is located above the collection box; a garbage lifting and conveying device is arranged in the furling opening; the garbage classification mechanism comprises a vibration screening mechanism located in front of the output end of the garbage lifting and conveying device, a high-pressure injection mechanism is arranged below the vibration screening mechanism, and a separation box body is arranged in front of the vibration screening mechanism; the spraying end of the high-pressure spraying mechanism is arranged in the separation box body and located below the conveying end of th