Process for efficiently separating nickel and copper in nickel electrolyte

The invention discloses a process for efficiently separating nickel and copper in a nickel electrolyte. The process comprises the following steps that hydrogen sulfide gas is input into the nickel electrolyte to generate a first-stage sulfuration reaction, solids and liquid are separated, obtained first-stage filter liquor continues to adopt hydrogen sulfide gas to generate a second-stage sulfuration reaction, solids and liquid are separated, and treatment to the nickel electrolyte is completed. In the process, the two-stage sulfuration treatment process is adopted for carrying out deep decoppering treatment on the nickel electrolyte, on the premise that decoppering reaches the standard, the copper-nickel ratio of copper sulphide slag can be effectively improved, the problem that the copper sulphide slag cannot directly return a copper recovery system due to the low copper-nickel ratio of the copper sulphide slag is solved, nickel losses in the nickel electrolyte can be reduced, and therefore recycling of nic