The invention relates to the technical field of oil-gas well formation test and production test, and discloses a method for optimizing a discharging and mining system of an oil-gas well by utilizing alubricating nipple coefficient. The method comprises the steps that S1, the lubricating nipple coefficient is calculated according to the production amount per day of a single well at the formation testing stage; S2, a lubricating nipple coefficient curve rate is calculated according to the lubricating nipple coefficient; S3, a lubricating nipple coefficient curve is set to be in an upwarping shape, a horizontal shape and a falling shape; S4, the lubricating nipple coefficient curve rate after one day interval is calculated; and S5, analyzing is conducted continuously by returning back to thestep 3. According to the method, a mode that a lubricating nipple is selected according to on-site subjective experience is changed, the problem of selecting the lubricating nipple over the years issolved, the discharging and mining time of fracturing fluid is shortened, the discharging and mining cost is saved, and the reservoir and oil well safety is protected.