IGBT packaging tube cap flatness detection method and device

The invention discloses an IGBT packaging tube cover flatness detection method and device, and the method comprises the steps: enabling a to-be-detected surface of a packaging tube cover to face downwards and be located at a position parallel to a standard platform in an overhead manner above the standard platform through three supporting needles, setting an elastic needle to move below the packaging tube cover to detect the flatness of each part, and enabling the elastic needle to move to a certain position when the elastic needle is located at a certain position and the top of the elastic needle is in contact with the packaging tube cover. A go-no go gauge is adopted to detect whether the height between the bottom of the vibrating needle and the standard platform meets requirements. According to the invention, the packaging tube cap is positioned above the reference platform in parallel by using the supporting needle, and then the bouncing needle is matched with the go-no go gauge to judge whether the flatn