A provided pesticide mother liquid comprises, in percent by weight, 1%-20% of n active composition A, 1%-98% of one solvent B selected from C8-C19 low alkane solvents, 1%-98% of one or more cosolvents C selected from diethyl phthalate, diisopropyl adipate, dibutyl adipate, epoxy soybean oil, epoxidized fatty acid methyl esters, soybean oil, isopropyl myristate, tributyl citrate, dimethyl carbonate, n-butanol, n-amyl alcohol and n-octyl alcohol; and the active composition A is a pyrethroid compound shown as a formula (X1). The pesticide mother liquid solves multiple technological problems that the active composition A is difficult to dissolve in low alkane solvents and generates a large amount of impurities after being dissolved and influences downstream usage.