A disposable two-step endoscope for examining human organs includes an image capturing and transmission device and a cable that may be disconnected. The image capturing and transmission device includes a body, luminous devices, an optical image capturing device, a wireless transmission device and an internal power supply. The cable transmits the electric power outside and signals. The luminous device projects light on the human organs. The optical image capturing device captures organ images. The wireless transmission device transmits the organ images outside the human body. The internal power supply provides electric power for signal transmission after the cable and the image capturing and transmission device are separated.