Glass cover structure of magnifying glass on desk lamp

The utility model relates to a magnifying glass cap structure which is arranged on a desk lamp. A magnifying glass and a lighttight glass cap are arranged on one end of the desk lamp. The magnifying glass is provided to look into the magnified objects along the condensing surface direction to the astigmatism surface direction through lampshade internal light bulb projectiles bright ray to outside. The glass cap is arranged on the lampshade of the condensing surface of the magnifying glass, and a mental sheet is buried in the glass cap. The mental sheet is corresponding to a magnetic component which is buried in the lampshade. The magnetic component adsorbs the mental sheet when the glass cap is opened, which makes the glass cap adsorbed and steadily lies on the lampshade. The glass cap can be arranged on the condensing surface of the magnifying glass to avoid danger when light is condensed and heat is produced, thereby increasing the convenience of utilizing magnifying glass caps in desk lamps.