The invention discloses a machining method for a rope for distant-water fishery. The machining method is characterized by comprising the following steps: pre-mixing UHMWPE powder, silicone powder, an antioxidant 1010, a nano-silver-loaded titanium dioxide antibacterial agent, hydroxy stearic acid, nano-scale white carbon black, antioxidant aid DLTP, ethylene-vinyl acetate copolymer, nano-scale diatomaceous earth and white oil which are weighed according to a formula, and then pouring the mixture into a high-speed kneading pot for performing high-speed kneading to obtain a UHMWPE-modified compound material; melting and extruding the UHMWPE-modified compound material through a double-screw extruding machine; metering an extrudate through a metering pump which is additionally mounted at the outlet of the double-screw extruding machine, and melting and extruding the extrudate from spinning holes; cooling and pre-stretching the extruded as-spun fibres; after the pre-stretched fibres are subjected to heat setting, winding melt-spinning tows by a fibre winding machine using a torque motor; performing primary twisting on the melt-spinning tows to obtain an S-directional rope strand; machining three S-directional rope strands into a Z-twisted rope for the distant-water fishery through a three-strand rope twisting machine.