Device for protection of conveyor belt against fire contains a conveyor belt in contact with the drive drum, a connected key element and a conveyor control relay, the second input of which is connected to the common output of the device. The output is connected to the conveyor control circuit. The input of the key element is connected to the power supply, and the temperature sensor, the amplifier-converter, the first threshold element, and the first delay unit are connected in series. The second input of the first threshold element is connected to the first source of constant input action. The device additionally contains a second source of constant input action, a speed sensor of the drive drum located on its shaft, a conveyor belt speed sensor, a totalizer, a second threshold element, a second delay unit, an element I, the second input of which is connected to the output of the first delay unit, and the output is connected to the second input of the key element. The output of the drive drum speed sensor is connected to the second input of the adder. The second source of constant input action is connected to the second input of the second threshold element
