In a device for pulling a net from a fishing boat equipped with a hydraulic device, the main rack (12) is formed mainly by combining the main support plate (13) in the longitudinal direction on the outside and forming the main pipe hole (17) inside the large diameter. The main pipe hole (17) is formed on the inside with a small diameter to form a main fixing bracket (15), and the main drum pipe (14) is coupled to the main la bracket (12) side, and the main fixing bracket (15) side is formed. Constituting the main drum (10) constituting the main pipe (11) conical shape coupled to the main pipe (16)； A drive device 40 consisting of a pipe 41 coupled to the shaft bearings 42 on both sides and a shaft 43 coupled to the gear bracket 45 coupled to the gear bearing 46 on one side； The pipe 41 is coupled to the main rack bracket 12, the main rack bracket 12 is coupled to the ring gear 44-3, and the shaft 43 is formed from both shaft bearings 42. Fitted to the inner diameter, one of the sun gear (44-1), the gear bracket (45), the connector (47), and the hydraulic motor (48) are sequentially combined, and the other is characterized in that the nut (49) is combined. In addition, a fixed bracket (35) having a smaller diameter than the first drum bracket (31) forming a pipe hole (37) as a circular plate material and the first drum bracket (31) forming a pipe hole (37) as a circular plate material ), the first support 32, which is a pipe of six or more squares, is dividedly coupled, and a first support plate 33 made of rubber is coupled to the top of each first support 32, and the first The drum pipe 34 is coupled to the upper part of the first support 32 on the side of the drum bracket 31, and the fixed pipe 36 is coupled to the upper part of the first support 32 on the side of the fixed bracket 35, so that the first Constituting the drum 30； A drive device 40 consisting of a pipe 41 coupled to the shaft bearings 42 on both sides and a shaft 43 coupled to the gear bracket 45 cou
