The invention provides a collophanite froth flotation collecting agent and a preparation method of the collophanite froth flotation collecting agent. The collophanite froth flotation collecting agent comprises, by mass, 0.3-0.75 part of stearic acid, 0.2-0.5 part of oleic acid and 0.05-0.2 part of citric acid. The stearic acid and the oleic acid are uniformly mixed, a sodium hydroxide solution is added for a saponification reaction, the citric acid is added and uniformly mixed, sodium chloride is added for salting out, a surface active agent is added, a primary substance is obtained after uniform stirring is conducted, diesel oil is added and uniformly stirred, and the collophanite froth flotation collecting agent can be obtained. The obtained collophanite froth flotation collecting agent is good in selectivity, high in collecting capacity, high in flotation speed and small in material consumption. Only 1.0 kg-2 kg/t of the collecting agent is consumed for each ton of ore, 20%-40% of the collophanite froth flotation collecting agent is reduced compared with a conventional collecting agent, and 2.5 yuan of agent cost is saved for each ton of raw ore. The collecting agent is used for positive floatation roughing, only three minutes are consumed for flotation, and 4-6 minutes needs to be consumed for the conventional collecting agent.