Gold ore flotation combined reagent and use method thereof

The invention discloses a gold ore flotation combined reagent and a using method thereof. The gold ore flotation combined reagent comprises an adjusting agent, a collecting agent and a foaming agent. The regulator comprises sodium sulfide, copper sulfate, water glass and sodium hexametaphosphate; the collecting agent comprises a C745a agent, isoamyl xanthate, ammonium dibutyl dithiophosphate and N, N-diethyldithiocarbamate; the foaming agent is No.2 oil in parts by weight; the use method comprises the following steps: adding regulators sodium sulfide, water glass and sodium hexametaphosphate into ore pulp in a ball mill; adding a regulator copper sulfate into the grader; a collecting agent C745a agent and a foaming agent 2 # oil are added into ore pulp before roughing; 50% of isoamyl xanthate, 20% of ammonium dibutyl dithiophosphate and 10% of diethyldithiocarbamate are added into ore pulp in the roughing process, the primary scavenging process and the secondary scavenging process respectively. According to t