Detinning agent for tinned copper alloy

The invention discloses a detinning agent for tinned copper alloy, which is characterized in that the detinning agent comprises the following components: 120g/L to 180g/L of sodium hydroxide, 5g/L to 10g/L of Na salt anionic surfactant, 10g/L to 30g/L of sodium tripolyphosphate, 10g/L to 20g/L of sodium citrate, 5g/L to 10g/L of sodium sulfate and the balance of water. By controlling the adding amount of the sodium hydroxide, the Na salt anionic surfactant, the sodium tripolyphosphate, the sodium citrate and the sodium sulfate, the tin content in the tin-plated copper alloy waste materials such as water tank copper and tin-plated pipe, rod and wire materials can be greatly reduced, the tin content in the waste materials can be reduced by 60% or above, that is, the detinning rate of the detinning agent is 60% or above, and not only can the materials be flexibly prepared, but also the cost is reduced. And the eluted tin can be recycled and sold, so that the utilization rate of the water tank copper and other wa