Approaching type broadband optical pyrometer

The invention discloses an approaching type broadband optical pyrometer. The approaching type broadband optical pyrometer comprises a protecting pipe, a plano-convex lens, a lens base, a connecting part, an optical detector, a photoelectric processor and a temperature displaying unit, the plano-convex lens and the outside lens base are sealed and embedded together into the rear end of the protecting pipe, the convex end of the plano-convex lens faces the front end of the protecting pipe, the end face of the planar end of the plano-convex lens and the end face of the tail end of the protectingpipe are located at the same plane, the optical detector and a connecting clamping part outside the protecting pipe are fixedly connected and are arranged at the focus of the plano-convex lens, and the optical detector is electrically with the photoelectric processor and the temperature display unit and is grounded. The approaching type broadband optical pyrometer is low in cost, high in cost performance, convenient to operate and high in practicability and can accurately measure the temperature on the surface of liquid in a high temperature molten state.