Sterilizer and method for detecting its sterilizing power

A sterilizer and a method for detecting sterilizing power are provided for an user to recognize a sterilizing power of the sterilizer and use hours of a sterilizing lamp, thereby enhancing stability and reliability of the sterilizer. The sterilizer for detecting a sterilizing power comprises a sterilizing chamber(100); a sterilizing lamp(110); a sensor(120) for detecting a sterilizing ray of the lamp; a door open sensor(130) for detecting the door of the chamber open; a control part(200) for outputting control signals according to the signals input from the sensors; and a warning part(300) for outputting warning signals of the sterilizing effect according to signals of the control part.