Vehicle state monitoring and warning method in V2G charging pile

The invention discloses a vehicle state monitoring and warning method in a V2G charging pile, and relates to the technical field of vehicle charging monitoring and early warning. Corresponding actions of the charging pile, voltage and current output information and vehicle end battery state information in the discharging process are collected in real time, and all the information collected by the charging pile is subjected to time marking; the message is received from the vehicle end; predicting the state of the vehicle end battery, and judging whether a predicted value or trend is consistent with the actual parameter change value or trend of the battery or not, or is within a certain error allowable range; if the conditions are met, continuously keeping discharging; otherwise, the charging pile actively reduces the output power and triggers early warning; and after each time of discharging is normally ended or abnormally ended, the collected data and analysis results are stored in a local historical file and