this disclosure provides a facial green method for metal cyanides preparation , including the following steps : 1 ) supported metal nanoparticles and fenton &# 39 ; s reagent are mixed with nitrile and then stirred to obtain suspension , wherein metal nanoparticles are selected from a nano metal , nano metal oxide and nano metal salt ; 2 ) centrifuging the suspension to obtain a product and drying the product after stirring to obtain the metal cyanides . as prepared metal cyanides have broad application prospects in the fields of sensor , battery , medicine , electroplating and catalysis . this fenton - improved cyanation method may effectively exclude the toxicity from free cyanide anions and get rid of uv - light , being more energy - saving and more feasible for large - scale industrial production of mcs .