Embodiments of the invention disclose a method and a device for realizing a key function by infrared induction, the method can realize the key function by infrared induction and solves the problem of key failure, and production procedures are reduced. The method disclosed by the embodiments of the invention comprises the steps of: after preset application is started, receiving reflection infrared by an infrared lamp, wherein the reflection infrared is reflected infrared of the infrared lamp; monitoring the intensity of the reflection infrared; if the condition that the intensity of the reflection infrared is determined, reporting a key command corresponding to the infrared lamp to the preset application, so as to enable the preset application to execute the key command.