The invention provides a method of determining recoverable reserves in oil reservoir production wells. The method comprises following steps: obtaining production curves of an oil well, and averaging the production curves of the oil well; determining an initial point of the Arps decline analysis according to the averaged production curves; performing ARPS decline analysis using the initial point as the start point of the decline analysis to predict recoverable reserves in oil reservoir production wells. The output change determined by the above method is highly coincided with the recoverable reserves; the accuracy requirement of oil reservoir engineering is satisfied; the method can be applied in determination of reservoir production wells yield changes and recoverable reserves without the stratum parameters.