The invention discloses a data storage method and apparatus. The method comprises the steps of receiving a data storage request, and determining at least two unique constraint conditions of to-be-stored data according to the data storage request; and when it is determined that a unique constraint condition as same as any unique constraint condition in the at least two unique constraint conditions does not exist in a unique constraint condition database, storing the to-be-stored data in a first storage node, wherein the unique constraint condition database comprises all unique constraint conditions extracted from all stored data belonging to a same data type with the to-be-stored data. According to the scheme, the to-be-stored data is stored only when the at least two unique constraint conditions are not found in the unique constraint condition database, so that the defect of repeated storage of the same data is overcome.