The invention relates to an electronic digital endoscope. The electronic digital endoscope comprises an endoscope body, an annular illumination device, a handheld camera, a focusing device, an LED cold light source and an inflation device. The handheld camera is connected with the focusing device through a movable connecting structure, the focusing device is connected with the eyepiece end of the annular illumination device through a rapid connecting clamping ring, the illuminating end of the annular illumination device is connected with the endoscope body in a threaded mode, and the LED cold light source and the inflation device are connected with a light passing pipe of the annular illumination device and a ventilating pipe of the annular illumination device respectively. The annular illumination device is adopted, and therefore the lighting effect is good, no illumination dark points exist, and the illumination is uniform. The focusing device is rapidly connected with the annular illumination device through the rapid connecting clamping ring, operation is convenient, and locking is firm. The focusing device can be replaced by focusing devices with different focal lengths according to the different endoscope bodies and different use environments, and the endoscope is convenient and flexible to use.