The embodiment of the invention discloses a reference voltage source circuit system and a power device, and is applied to the technical field of electronic circuits. In the system, a negative temperature coefficient voltage can be output by mutual connection of n N-type field effect transistors, and the output voltage can be connected with a positive temperature coefficient circuit 12 to be compensated, so that a temperature independent voltage can be output to supply power to another electronic device. According to the system and the device, the N-type field effect transistors are adopted, so that the problem of incompatibility with a standard CMOS (complementary metal oxide semiconductor) process due to use of diodes or triodes is solved; moreover, the output temperature independent voltage can be lower than 0.8 V, so that the system and the device are consistent with the current development trend of low power voltage and low power consumption of electronic equipment.