The invention discloses a data processing method of calibration of an oil tank volume table with integral. The method comprises the steps that first, oil tank oil gun data is collected and stored in a database; second, screening is conducted on the collected data, and meanwhile a tank gun relation table of every oil tank in a gas station is obtained; third, data preprocessing is conducted on the screened data based on the tank gun relation table, and effective data pairs are obtained; fourth, curve fitting is conducted on the effective data pairs, then integral is conducted on the fitted curve formula to obtain the mathematical expression of the height and volume of each oil tank, and the volume table is generated; fifth, error analysis is conducted on the volume table generated. Through implementation of the data processing method, in the condition that closure and tank emptying are not needed, normal operation of the gas station is ensured, and management of quantity and quality of the gas station is improved.