The utility model relates to an anti-fog protection device of a borehole television probe, belonging to the field of the manufacture of engineering detection equipment. The anti-fog protection device of the borehole television probe is composed of an outer tube connector, a sealing ring, a transparent isolation layer, a light transmission cover, an outer tube tail seat and a dehumidifying layer, wherein the transparent isolation layer is mounted in the upper end of the light transmission cover in a pressing way; the dehumidifying layer is arranged at the lower end of the light transmission cover; an independent closed space is formed between the light transmission cover and the outer tube tail seat, so that fog is avoided being formed in the light transmission cover, and the fog produced due to temperature difference between the temperature above the ground and the temperature below the ground can be avoided; and meanwhile, the dehumidifying layer arranged on the outer tube tail seat can remove water vapor in the closed space to the maximum extent, so that the fog is reduced to the maximum extent. The anti-fog protection device of the borehole television probe is reasonable in design, simple in structure and convenient to mount and use, and is capable of guaranteeing clear shooting of the borehole television probe in work, effectively shortening the construction time and reducing the constriction risk at the same time.