The present invention relates to a pet entrance/exit device and, more specifically, is provided at a fence or a safety door so that a pet can enter/exit, adjusts the size and position of an entrance/exit of a door frame part by means of a plurality of opening/closing bars so that small animals can freely enter/exit and large animals cannot easily enter/exit so as not to invade the area and feed of the small animals, thereby enabling the small animals to maintain a comfortable and stable life, forms the entrance/exit, formed at the door frame part, at a high position by means of the plurality of opening/closing bars so as to prevent the small animals from invading the area and feed of the large animals so that the large animals, which cannot cope with the small animals, can maintain a comfortable and stable life, has a cover fence formed at the upper part of the fence so as to prevent the large animals from jumping over the fence, thereby ensuring an area for the small animals, and is provided at the cover fence so that the large animals can jump up onto the cover fence and enter/exit, whereas the small animals cannot jump up thereon, thereby ensuring an area for the large animals.La présente invention concerne un dispositif d'entrée/de sortie pour animal de compagnie et, plus spécifiquement, est muni d'une clôture ou d'une porte de sécurité de sorte qu'un animal de compagnie puisse entrer/sortir, ajuste la taille et la position d'une entrée/sortie d'une partie cadre de porte à l'aide d'une pluralité de barres d'ouverture/de fermeture, de sorte que de petits animaux puissent librement entrer/sortir et que de grands animaux ne puissent pas facilement entrer/sortir afin de ne pas envahir la zone et l'aliment des petits animaux, ce qui permet aux petits animaux de conserver une vie confortable et stable, forme l'entrée/sortie, formée au niveau de la partie cadre de porte, à une position élevée à l'aide de la pluralité de barres d'ouverture/de fermeture afin d'empêcher l
