Synergistic natural gas filling process

The invention relates to a natural gas filling process, and discloses a synergistic natural gas filling process, which comprises the following steps: after gas is supplied to a tank car, the gas is unloaded to a gas unloading column, and then the natural gas is compressed to 23 MPa in a compressor unit; the natural gas is converged into a gas conveying pipe through a high-pressure pipeline distribution control panel, and then real-time flow data of the natural gas in the pipeline are collected through a flow device; a control system of synergist adding equipment adds a synergist according to the flow data; flowing to a static mixer for initial mixing is carried out; flowing to a buffer gas storage tank to be uniformly mixed is carried out; after being input into the gas filling column through a gas outlet pipeline of the buffer gas storage tank, the gas is filled into a steel cylinder through the filling distribution control panel and the filling busbar in sequence; and when the filling pressure of the steel