This invention provides a water-induced surface repair composite quantum dotand a method for preparation the same. Said water-induced surface repair composite quantum dot comprises a quantum dot, a protection unit, and a repairunit. The quantum dot includes a first layer composed of M1A1, the protection unitis adsorbed on the quantum dot, including an amine compound, and / or an ammonium salt, the repair unit adsorbs the quantum dot and includes metal ions. In addition, the invention also provides a method for manufacturing composite quantum dots after water repair, and a method for metal ion detection by using composite quantum dots with water-induced surface repair composite quantum dot. |