Fuel filter temperature control device, fuel filter and engine oil supply system

The invention relates to the field of vehicles, and discloses a fuel filter temperature control device, a fuel filter and an engine oil supply system. The temperature in the fuel filter is monitored in real time through the temperature detection unit, the relay supplies power to the temperature control module when the positive electricity wiring end and the negative electricity wiring end of the relay are both powered on, and the power supply state of the temperature control module is fed back through the state feedback end; the temperature control module selectively controls the heating unit to heat fuel oil in the fuel oil filter or controls the heating unit to stop working according to a detection result of the temperature detection unit; and the power supply state of the temperature control module is fed back in real time through the state feedback end of the relay, so that the fuel oil in the fuel oil filter can be prevented from wax precipitation to increase the resistance when the fuel oil passes throu