The invention relates to a high-brightness LED (Light Emitting Diode) cold light source device, which is mainly suitable for laparoscopic surgery or hysteroscopy of a human body. The device is characterized in that: an LED lamp comprises an LED substrate, an LED luminous body, a luminous body protection plate, a power supply guide plate, an LED power supply joint and an insulator, wherein the LEDluminous body, the luminous body protection plate, the power supply guide plate, the LED power supply joint and the insulator are positioned on the same side of the LED substrate, and are encapsulated with the LED substrate together to form an integrally-formed LED lamp; the luminous body protection plate including the LED luminous body is directly adjacent to a heat insulator; a light hole main body, the heat insulator, the luminous body protection plate and the LED luminous body are arrayed in sequence; the luminous body protection plate is close to the LED luminous body; and the LED luminous body corresponds to a light hole channel. The device has a reasonable, simple and compact structural design, is convenient, reliable and safe to use and install and has low manufacturing cost, highillumination, good radiating and surgery effects, a long service life, small heat productivity and a better comprehensive effect.