Circuit board preheating module

The utility model relates to a circuit board preheating module which can heat functional components on a circuit board and ensure normal operation of the functional components under a low-temperature environment. The circuit board preheating module comprises a central controller, a temperature sensor and three resistance heaters which are all welded on the circuit board. The temperature sensor and the resistance heaters are arranged around the functional components; after equipment in powered, the central controller sets temperature range values of the temperature sensor through a control interface; the temperature sensor can monitor the temperature of the circuit board in a real-time manner and reports the temperature to the central controller; the central controller controls the resistance heaters and enables the same to heat the circuit board; in a short time, local temperature of the circuit board is increased; and therefore, a favorable temperature environment can be provided for the functional components, and the requirement for a low-temperature operation range can be lowered. The circuit board preheating module is advantageous in simple and practical design, obvious effect, low cost, wide application range and great suitability for electronic products which have higher requirements for low-temperature operation conditions.