Citric acid series copper alloy pickling solution and preparation method thereof

The invention provides a citric acid series copper alloy pickling solution and a preparation method thereof, and the citric acid series copper alloy pickling solution comprises the following raw materials in percentage by weight: 10%-15% of citric acid, 2%-4% of a surfactant, 0.2%-1% of a corrosion inhibitor, 0.2%-1% of a metal complexing agent, 0.2%-0.5% of a polarization agent, 1%-2% of a buffering agent and the balance of water. The citric acid series copper alloy pickling solution provided by the invention is a non-dangerous article, can well remove oxide skin on the surface of a copper alloy blank cake, and does not change color on the surface of the copper alloy in the pickling process under the condition that the citric acid series copper alloy pickling solution is used in cooperation with a cleaning solution; the surface of the polished copper alloy blank cake is free of obvious quality defects such as water stains, smudginess, discoloration and grinding marks, and the quality requirements of subseque