The present invention discloses a snap door structure configured with an opening and a snap joint part. The snap door structure comprises a door cover, a switch puller and a stopper. The door cover is pivotally connected to the electronic device and installed in correspondence with the opening. The switch puller is connected to the door cover and slidable with respect thereto, in which the switch puller includes a clip joint segment and a snap connection part. The stopper is fixedly set to the door cover and clip latched between the door cover and the switch puller. The stopper has an elastic arm, in which the elastic arm along with the clip joint segment enable a multi-staged position adjustment function in order to cause the snap connection part to be correspondingly buckled to the snap joint part thus allowing coverage of the door cover on the opening.