LED (Light-Emitting Diode) signal light source with temperature compensating function

The invention relates to an LED (Light-Emitting Diode) signal light source, in particular to an LED signal light source with a temperature compensating function. The LED signal light source with the temperature compensating function comprises an LED light tube, wherein a temperature compensating circuit is arranged in a power supply circuit of the LED light tube, and comprises a heating resistor (R1) and a temperature switch (KT1); and the heating resistor (R1) and the temperature switch (KT1) are connected in parallel or in series with each other, and are connected in parallel or in series to the power supply circuit of the LED light tube. In the LED signal light source, the chroma (color spectrum) offset phenomenon of an LED signal lamp at low temperature is compensated, so that the LED signal light source can meet the requirements of a chroma (color spectrum) standard within the entire working temperature section, and the problem of color spectrum offset caused by the ambient temperature is solved. The implementation mode is simple, and the reliability of the LED signal lamp is enhanced remarkably.