The utility model discloses a movable under-glass plate temperature measuring mechanism, which comprises a base. The base is provided with a parallel walking guide rail; a walking trolley is arranged on the walking guide rail; the front end of the walking trolley is provided with a baffle; the tail end of the walking trolley is provided with a push-pull handle opposite to the baffle; the upper end surface of the walking trolley is provided with an infrared temperature measuring instrument; one side wall of the walking trolley is provided with a scale; the zero position of the scale is aligned with the front end of the walking trolley; and the scale is longer than the tail end of the walking trolley and the exceeding part is suspended in the air. According to the movable under-glass plate temperature measuring mechanism, features of an annealing furnace itself are used, the mechanism directly enters the furnace body to be directly aimed at the glass panel via an observation opening, the temperature can be accurately measured, the temperature of any region in the annealing furnace can be measured, the position of the measured point on the glass panel can be accurately positioned by using the scale provided with the mechanism itself, and movable, accurate, multi-channel and multi-point temperature measurement can be realized.