The invention provides a method for producing battery-grade lithium hydroxide. The method includes the steps: performing calcination, grinding, acidification, leaching and separation on lithium concentrates to obtain lithium sulfate solution; concentrating the obtained lithium sulfate solution, and directly adding solid sodium carbonate to precipitate lithium to obtain lithium carbonate precipitation; causticizing the obtained lithium carbonate by lime, and purifying the causticized lithium carbonate to obtain the battery-grade lithium hydroxide. The method can solve the problems of low yield, large mother solution amount, high evaporation energy consumption and accumulation of soluble impurities in the prior art. According to the method, the problems of hardening and dust of the lithium hydroxide are improved by the aid of modifying agents.