Sales prediction method and system, and storage medium

The invention discloses a sales volume prediction method and system and a storage medium, and relates to the technical field of prediction algorithm design, and the method comprises the following steps: obtaining historical sales data, product sample data and a to-be-adjusted product set, carrying out the data cleaning of the historical sales data to obtain cleaned processing data, adjusting historical sales SKU in the processing data according to the to-be-adjusted product set to form final data; corresponding weights are given to the corresponding sales products for the sales volumes in the processing data, and all the sales products with the weights and the product sample data are combined together to form final data; and inputting the final data into a preset prediction algorithm to obtain a prediction result. According to the method, historical sales data are simplified by cleaning data without representativeness and removing data corresponding to off-shelf products, and prediction is performed according