A nanosecond laser is used to excite the aluminum foil to generate plasma. The aluminum foil is heated and the influences of sample temperature on the intensity and the signal-to-noise ratio of laser-induced breakdown spectroscopy are investigated. The diameter of ablation crater is measured, and the relaionship between the crater diameter and the sample temperature is observed. The research results show that the increase in sample temperature leads to the increase in the spectral intensity and the signal-to-noise ratio of two spectral lines of aluminum, the crater diameter also increases with the increase of sample temperature. It is validated that increasing the sample temperature can improve the sensitivity of the laser-induced breakdown spectroscopy.