Abstract: The present disclosure discloses a grid supply load predicting method, a system, and a storage medium. The method includes: determining a characteristic historical data set of a grid supply load; obtaining a grid supply load characteristic trend prediction result by inputting the characteristic data set of the historical grid supply load and the daily characteristic data of target influencing factor into a preset trend prediction model for grid supply load characteristic trend prediction; determining a grid supply load curve type; obtaining a grid supply load prediction model corresponding to the grid supply load curve type to take as a target prediction model; and obtaining a target grid supply load prediction result by inputting the historical data set of the grid supply load, the grid supply load characteristic trend prediction result and the daily characteristic data of target influencing factor into the target prediction model for grid supply load prediction.