The invention relates to a method of determining the reasonable salvage time of a down-hole choke, comprising the following steps: firstly, taking a down-hole choke as a solution node; secondly, drawing a capacity differential curve; thirdly, drawing an oil pipe dynamic curve; and fourthly, determining the salvage time of the down-hole choke according to the location of the intersection of the two curves. For a tight sandstone high-heterogeneity lithologic gas reservoir liquid-accumulated gas well, the conventional phenomenon that a down-hole choke is salvaged only when there is a fault is changed, and passive salvage of down-hole chokes is converted into active prevention. A practical and convenient method of determining the reasonable salvage time of a down-hole choke is provided. The method is reliable in principle. Compared with the existing down-hole choke salvage condition, the method is more scientific and reasonable.