The utility model relates to a rubber vulcanizing temperature on-line pre-measuring controlling instrument which is composed of a casing, a circuit board, an indicator light, a displaying pipe, a keyboard and a sensor group which are connected, wherein the circuit board is arranged in the casing, the indicator light, the displaying pipe and the keyboard are arranged in a face board and an operation table board of the casing and are respectively connected with the corresponding points of the circuit board, and the sensor group is connected with the corresponding point of an amplifying circuit of the circuit board; a circuit is composed of the amplifying circuit, an A/D converting circuit, a single-chip computer, a display circuit, an alarm circuit, a keyboard controlling circuit, a D/A converting circuit and an actuating mechanism controlling circuit which are connected through respective signal lines. The utility model completely overcomes and solves the disadvantages and the problems existing in the prior art and has the advantages of high intellectualized degree, high accuracy and reliability, convenient use and maintenance and high speed and efficiency.