The present invention relates to an adjustable oral cavity support bracket, which comprises a first opening-up member, a second opening-up member, and two connection assemblies connected with the first and second opening-up members. The first opening-up member comprises two first side bars and a first connection bar connecting the two first side bars. Each of the first side bars has a first opening-up slot. The second opening-up member comprises two second side bars and a second connection bar connecting two second side bars. Each of the second side bars has a second opening-up slot. The connection assemblies each comprises a first pivot bar pivotally connected to the first opening-up member and a second pivot bar pivotally connected to the second opening-up member. The first pivot bar and the second pivot bar are mutually pivotally connected. As such, the upper and lower jaws of a patient can be opened to allow for easy passage of a medical treatment device to reach an affected portion for treatment.本發明可調節式口腔支撐架,包括一第一撐開件、一第二撐開件及二連接該第一、第二撐開件的連接組件,該第一撐開件設二第一側桿及一連接該二第一側桿的第一連接桿,該第一側桿具有一第一撐開槽,該第二撐開件設二第二側桿及一連接該二第二側桿的第二連接桿,該第二側桿具有一第二撐開槽,該連接組件具有一與該第一撐開件相樞接的第一樞桿及一與該第二撐開件相樞接的第二樞桿,該第一樞桿與該第二樞桿樞接,據此撐開病人的上、下頷便於一醫療器具通過並伸入患部作治療。10‧‧‧第一撐開件11‧‧‧第一側桿111‧‧‧第一外隔片112‧‧‧第一內隔片113‧‧‧第一支撐片114‧‧‧第一穿孔115‧‧‧第一凸耳116‧‧‧第一耳孔12‧‧‧第一連接桿121‧‧‧第一定位槽13‧‧‧第一撐開槽20‧‧‧第二撐開件21‧‧‧第二側桿211‧‧‧第二外隔片212‧‧‧第二內隔片213‧‧‧第二支撐片214‧‧‧第二穿孔215‧‧‧第二凸耳216‧‧‧第二耳孔218‧‧‧凸部22‧‧‧第二連接桿221‧‧‧第二定位槽23‧‧‧第二撐開槽30‧‧‧連接組件31‧‧‧第一樞桿311‧‧‧第一樞接點312‧‧‧第一插接部313‧‧‧第三樞接點32‧‧‧第二樞桿321‧‧‧第二樞接點322‧‧‧第二插接部323‧‧‧第四樞接點33‧‧‧樞接件331‧‧‧接耳332‧‧‧凹槽333‧‧‧圓孔34‧‧‧套管
