An electronic pen button assembly includes a pen core, a housing, and a button. The pen core includes a rod body and a pen tip disposed at a first end of the rod body. A first limiting portion is disposed on the rod body. The housing includes a pen head with a via hole, and a second limiting portion is disposed in the housing. The rod body extends into the housing through the via hole, and the first limiting portion is matably connected to the second limiting portion. The pen core is in sliding fit relative to the housing in an extension direction of the rod body. The button is disposed in the housing, and the bottom is triggerable by a second end of the rod body during sliding of the pen core along the extension direction of the rod body.