The new environmentally friendly gold extraction agent achieves a leaching rate of over 85% for ultra-low grade oxidized ore at a concentration of 1.5g/t, and reduces impurity leaching by 90%; The drug consumption is 0.3-0.5kg/ton, which is 40% cheaper than sodium cyanide. Principle: Molecular level "recognition" of gold atoms, selective complexation, suitable for heap leaching/pool leaching/carbon slurry processes.