The invention relates to an omnidirectional video device, which comprise an omnidirectional camera, a microprocessor, a memory, and a display. Wherein, the omnidirectional camera is formed by reflective element, lens, and camera element; the reflective element comprises hyperbola mirror; the CCD camera element is at the virtual focus of hyperbola mirror; the lens is between the CCD camera element and the hyperbola mirror; the camera element, via video input interface, is connected to the microprocessor; the display is connected to the video output interface of microprocessor; the microprocessor comprises an image collecting module, an image storage module, an image pretreatment module for removing noise and smoothening the collected image, an image initialization module, an image expanding processing module for using geometry conversation to unfold the round omnidirectional image obtained by CCD camera element into rectangle cylinder omnidirectional image, and an image output module. The invention can obtain real-time omnidirectional image in high accuracy, without torsion.