The invention discloses a fine desulfurizer used for removing thiol from liquid hydrocarbon at normal temperature, a preparation method thereof and an application method thereof. The fine desulfurizer is prepared by blending powder of one to three compounds of copper oxide, zinc oxide, lead hydroxide, nickel oxide, magnesium hydroxide, potassium hydroxide, vanadium pentoxide, manganese dioxide and cobalt oxide with aluminum hydroxide and adhesive CMC, and then extruding the mixture into strips, wherein based on mass percentage, the one to three compounds (in the form of oxide) accounts for 5 to 30 percent, the aluminum hydroxide accounts for 60 to 85 percent and the CMC accounts for 10 percent. The preparation method for the fine desulfurizer comprises the following steps of: blending the powder of one to three compounds, the aluminum hydroxide and adhesive according to the formula, extruding the mixture into strips, drying the strips for 2 to 4 hours at the temperature of 120 DEG C, and baking the mixture for over 3 hours in an air atmosphere at the temperature of 300 to 500 DEG C to prepare the fine desulfurizer. The fine desulfurizer can be widely used for removing the thiol from the liquid hydrocarbon, such as LPG, a solvent oil, a naphtha and the like, can remove the thiol from the liquid hydrocarbon at the temperature of 10 DEG C below zero to 100 DEG C and at an airspeed of 0.01 to 6h-1; the removal rate is over 90 percent; the treated liquid hydrocarbon is guaranteed to meet requirements; and sulfur capacity of the fine desulfurizer is 2 to 6 weight percent.