A multifunctional ship for collecting and recycling of ocean debris, comprising: a hull; a detector provided in the hull to detect ocean debris floating or deposited in seabed during anchoring or sailing of the hull; a collecting device installed in the hull to collect the ocean debris detected by the detector to the hull; a sorting device (4, 5) installed in the hull to sort the ocean debris collected by the collecting device by a characteristic; a compressing device installed in the hull to compress the ocean debris selected in the sorting device (4, 5) to remove moisture and reduce a volume of the ocean debris; a pyrolysis furnace to pyrolyze the compressed waste plastic; a waste plastic recycling device (6, 8) installed in the hull configured to pyrolyze the compressed waste plastic from the compressing device into the pyrolysis furnace through an input pipe, discharge an oil vapor and a sludge through a gas output pipe and a sludge discharge pipe, respectively, and produce a recycled oil; a storage tank installed at a bottom of the hull configured to store the recycled oil produced by the waste plastic recycling device (6, 8); a purification device configured to purify a wastewater generated in a process of producing recycled oil for recycling, wherein the input pipe, a pair of input screws on the inside of the pipe are installed horizontally side by side to be rotated by a driver to compress and transport the waste plastic, and the pair of input screws have a slit therebetween so that some overlap each other while being spaced apart; and an air inflow preventing plate with a plurality of input holes through which the waste plastic compressed by a pair of input screws passes is provided at a rear end of the input pipe in the vertical direction while being spaced apart from the inlet of the pyrolysis furnace, wherein the slit is formed in a wave shape and made of a gap of 2 to 10 mm so that the waste vinyl is compressed and transported, and the pair of input screws and the air inflow preventing plate are spaced apart by a predetermined gap, wherein the gap is 2 to 10 cm, and a protective layer is applied to the surface of the input screw, and the protective layer includes 10 to 20 wt.% of glass fiber, 5 to 10 wt.% of carbon fiber, and 5 to 10 wt.% of poly meth methyl acrylate in Teflon resin, wherein the air inflow preventing plate includes a circular plate having a predetermined thickness and having a plurality of input holes formed therethrough, a front coating layer applied to the front of the circular plate, and a rear coating layer applied to the rear surface of the circular plate. a hull; a detector provided in the hull to detect ocean debris floating or deposited in seabed during anchoring or sailing of the hull; a collecting device installed in the hull to collect the ocean debris detected by the detector to the hull; a sorting device (4, 5) installed in the hull to sort the ocean debris collected by the collecting device by a characteristic; a compressing device installed in the hull to compress the ocean debris selected in the sorting device (4, 5) to remove moisture and reduce a volume of the ocean debris; a pyrolysis furnace to pyrolyze the compressed waste plastic; a waste plastic recycling device (6, 8) installed in the hull configured to pyrolyze the compressed waste plastic from the compressing device into the pyrolysis furnace through an input pipe, discharge an oil vapor and a sludge through a gas output pipe and a sludge discharge pipe, respectively, and produce a recycled oil; a storage tank installed at a bottom of the hull configured to store the recycled oil produced by the waste plastic recycling device (6, 8); a purification device configured to purify a wastewater generated in a process of producing recycled oil for recycling, wherein the input pipe, a pair of input screws on the inside of the pipe are installed horizontally side by side to be rotated by a driver to compress and transport the waste plastic, and the pair of input screws have a slit therebetween so that some overlap each other while being spaced apart; and an air inflow preventing plate with a plurality of input holes through which the waste plastic compressed by a pair of input screws passes is provided at a rear end of the input pipe in the vertical direction while being spaced apart from the inlet of the pyrolysis furnace, wherein the slit is formed in a wave shape and made of a gap of 2 to 10 mm so that the waste vinyl is compressed and transported, and the pair of input screws and the air inflow preventing plate are spaced apart by a predetermined gap, wherein the gap is 2 to 10 cm, and a protective layer is applied to the surface of the input screw, and the protective layer includes 10 to 20 wt.% of glass fiber, 5 to 10 wt.% of carbon fiber, and 5 to 10 wt.% of poly meth methyl acrylate in Teflon resin, wherein the air inflow preventing plate includes a circular plate having a predetermined thickness and having a plurality of input holes formed therethrough, a front coating layer applied to the front of the circular plate, and a rear coating layer applied to the rear surface of the circular plate.