本发明提供了一种预制外墙板系统，其能够在构造预制的外壁板时构造包围结构构件的角壁及其方法，其中预制的外壁板系统可以防止预制的外壁板中的热桥 面板系统，可以提高气密性。 根据本发明的一个方面，预制外壁板系统包括：角部单元，其强制地装配到结构中以改善气密性; 壁单元，其中所述侧面形成在不同的高度，以改善连接到角部单元的连接部分处的气密性; 以及安装在壁单元和角部单元的内侧上的整理单元，以防止角部单元和结构分离并形成内壁。

Prefabricated external wall panel system according to one aspect of the present invention and a corner section for force fitting in a structure in order to improve the confidentiality, the wall unit that side is formed with a step to improve the airtightness of the joint portion is joined with the corner section, is provided in the wall portion and the inner corner of the corner portion prevented from dropping between the gujochegwa and may include a closed to form the interior side wall.