The invention discloses a high-definition and intelligent all-in-one machine device which comprises a device body. The device body is composed of a liquid crystal display arranged at the top of the device body, a fixing plate arranged at the bottom of the device body and a supporting frame arranged at the top of the fixing plate, wherein the fixing plate and the liquid crystal display are fixedly connected through screws, a power switch and a simple keyboard are installed on the side face of the liquid crystal display and are electrically connected with the liquid crystal display, and a heat dissipation plate is installed in the liquid crystal display. The problem of observation at a parallel sight angle in the question explaining process is solved by connecting a height adjustor and the supporting frame, the causes of vertebral column aching pain are decreased, an interface shows two forms on one screen by arranging a split-screen adjustor structure, the practicability of the high-definition and intelligent all-in-one machine device is improved to some degree, and the high-definition and intelligent all-in-one machine device has a very good development prospect in the future.