Atomic emission double-spectrum temperature measurement method was developed, and a photoelectric temperature detector based on silicon photomultiplier tube was designed. The structure and principle of the temperature measurement of the photoelectric temperature detector were introduced. The spectral radiation signal of the copper sheet excited by the laser was transmitted to the photoelectric thermometer, and Cu I 510.5 nm and Cu I 521.8 nm were used as the temperature scale spectral lines during the temperature measurement. In different acquisition delays, the ratio of the intensity of the two Cu plasma spectral lines was obtained through the LIBS system. At the same time, the ratio of the maximum voltage value of the two channels was measured using a photoelectric thermometer. At the time of 6us, and the maximum temperature of Cu plasma excited by different laser energy was calculated to be 12745 K. The results show that the atomic emission dual-spectrum temperature measurement method has the characteristics of the higher temperature measurement limit and faster response speed. [ABSTRACT FROM AUTHOR]