The utility model discloses a blast furnace tuyere furnace temperature monitoring device, which relates to the technical field of furnace temperature monitoring devices, and comprises a fixed plate, and the fixed plate is fixedly connected with the left side of a square straight-through pipe through a square groove formed in the fixed plate. According to the utility model, through the mutual cooperation of the round straight-through pipe, the square straight-through pipe, the internal thread mounting sleeve, the round visible hole and the round visible lens, an operator can conveniently observe the temperature condition in the blast furnace, and meanwhile, the safety of the operator can be guaranteed to a certain extent in the observation process; the temperature in the furnace can be monitored in real time through mutual cooperation of the furnace temperature monitoring sensor and the controller, the effect of on-site real-time monitoring is achieved, the two functions of manual observation and on-site temperature measurement are achieved, and the device is more accurate and reliable compared with the mode that the furnace temperature is judged independently through human eyes.