Centralized upgrading method based on one-machine four-pile charging pile and charging pile

The invention discloses a centralized upgrading method based on a one-machine four-pile charging pile and the charging pile, and the method comprises the following steps that: a host analyzes an upgrading request into a host upgrading file and an extension upgrading file after the host receives the upgrading request; the host issues the extension upgrading file to the charging extension, and the charging extension enters an upgrading state after receiving the upgrading file; in the upgrading state, new electric vehicle access is not received; the charging extension judges whether the control guide signals of the respective control guide circuits meet preset conditions or not, and if yes, upgrading is conducted according to the extension upgrading files; meanwhile, the charging extension sends a judgment result and an upgrading completion notification to the host; and the host comprehensively judges according to the judgment result, and if all the judgment results meet preset conditions, upgrading is carried o