The invention discloses a method for extracting valuable metals from low-nickel matte converter slag. According to the method for extracting the valuable metals from the low-nickel matte converter slag, the low-nickel matte converter slag is mixed with quicklime and roasted to obtain a roasted material, the roasted material is ground and magnetically separated to obtain silicate and iron-rich slag, a strong alkali solution is added into the iron-rich slag for soaking treatment, solid-liquid separation is carried out to obtain filtrate and filter residues, the filter residues are mixed with acid liquor, oxygen pressure acid leaching is carried out, solid-liquid separation is carried out to obtain leachate and iron oxide red, hydrogen sulfide gas is introduced into the leachate, the pH value is adjusted, and solid-liquid separation is carried out to obtain copper sulfide precipitate and nickel-cobalt-containing filtrate. According to the method for extracting the valuable metals from the low-nickel matte converter slag, silicon dioxide is removed through roasting to prepare silicate, then iron oxide red is prepared through acid leaching, and finally the leachate is subjected to metal separation, so that various components in the converter slag are fully utilized; and the technological process is short, each component of the low-nickel matte converter slag is effectively utilized, waste is turned into wealth, and loss of valuable metal elements is reduced.