The invention discloses an iris recognition method, an iris recognition device and a terminal and belongs to the communication technical field. With the iris recognition method and the iris recognition device of the invention adopted, the problem of inaccuracy of iris information collected by a terminal which is caused by differences of factors such as distances and angels between cameras which collect iris information and a collection region, and the pixels of the cameras can be solved. The method of the invention includes the following step that: a positional relationship between the camera of the terminal and an earphone worn by a user is obtained; if the positional relationship is different from a pre-stored positional relationship in a database, adjustment information is generated, wherein the adjustment information is used for instructing the user to adjust the positional relation between the camera and the earphone; and after the terminal or the user adjusts the positional relationship according to the adjustment information, the iris information of the user is acquired and recognized. The iris recognition method and the iris recognition device of the present invention are applicable to a terminal.