The present invention provides an identity card image inclined value obtaining method and device, a terminal and a storage medium. The method comprises the steps of: analyzing an identity card image,and extracting all the single character areas; performing grouping of all the single character areas to obtain a plurality of single character area sets; obtaining a single character area set with themaximum length; and obtaining an inclined value of a connection line section of two single character areas at the head and the tail in the single character area set with the maximum length, and determining the inclined value of the connection line section as the inclined value of the identity card image. The inclined value of the identity card image can be accurately obtained according to the invention.