The invention relates to an anti-dry burning device of a water fountain. The anti-dry burning device comprises a drinking bucket, wherein an electric heater is installed below the drinking bucket and is electrically connected with a power supply, a bimetallic strip is electrically connected to the other end of the electric heater and is electrically connected with a temperature control contact which is electrically connected with a electromagnetic relay, the electromagnetic relay is electrically connected with the power supply, the upper part of the bimetallic strip is installed in a ceramic cover which is installed on the right side of the electric heater, and the lower part of the bimetallic strip is installed in the middle of a bimetallic strip seat. According to the anti-dry burning device, thermal expansion of the bimetallic strip is mainly utilized to deform, so as to solve the problem, and the bimetallic strip and the electromagnetic relay have double poweroff switching functions, so that the safety and the reliability of the anti-dry burning device are improved. By using the anti-dry burning device, the safety of the water fountain can be guaranteed, and dry burning cannot occur even if no water exists.