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To develop new luminescent materials for optical thermometers, a series of Er3+/Eu3+doped double perovskite La2MgSnO6 phosphors are synthesized by a high-temperature solid-phase method. The structure, luminescence performance, energy transfer, and thermal sensitivity are systematically studied by X-ray diffraction (XRD), scanning electron microscopy fluorescence spectroscopy, lifetime decay curve, and temperature-dependent emission spectra. The prepared samples possess good coincidence with pure perovskite phase, and the refined high-quality XRD data reveal that Eu3+ and Er3+jointly occupy La3+ sites. which is attributed to the effective energy transfer from Er3+ to Eu3+ ions. By adjusting the doping concentration of Eu3+, the emission of Er3+ is attenuated and the luminous color is modulated from green to orange-red. These demonstrate the existence of energy transfer between Er3+ and Eu3+. In addition, the optimized La2MgSnO6: 0.075Er3+, 0.04Eu3+ phosphor exhibits excellent thermal stability and good temperature cycling. The emission intensity showed good cycling in the process of repeated heating and cooling, and maintained to 76% of the initial temperature (303K) at 403K. Studied the optical temperature sensing performance of LMS: 0.075Er3+, 0.04Eu3+ fluorescent powder. The results of fitting the fluorescence intensity ratio with the non-thermal coupling characteristic peaks of 555 and 706nm showed excellent optical sensitivity, and the Sa and Sr were calculated as 0.0029K−1 and 1.21%K−1, respectively. All results indicate that LMS: 0.075Er3+, 0.04Eu3+ phosphors could have potential applications for non-contact optical temperature measurement materials. [ABSTRACT FROM AUTHOR]