Space gravitational wave detection is oriented to gravitational wave signals in 0.1 mHz～1 Hz band, which contains wave source information of larger characteristic mass and scale. The current space gravitational wave detection plans use large laser interferometer devices to detect, in which the sensitivity of key components, such as the laser light source system and the drag-free system, depends on extremely low electrical noise, which is limited by thenoise level of the voltage reference source on the spacecraft. Therefore, it is necessary to develop low noise voltage reference and perform low-frequency noise characterization of laser intensity noise and electrical noise of key electrical devices. In this paper, the development of low noise voltage reference source is realized by selecting a low noise reference chip, designing relevant peripheral circuits, simulation, electromagnetic shielding, using low temperature drift factor element, low noise power supply and active temperature control. Since existing commercial equipment cannot be used for noise analysis in the 0.1 mHz～1 Hz band, we use a high-precision digital multimeter to test and collect the output voltage of the voltage referencesource under different environmental conditions, including free operation, external shielding shell, external temperature control and shielding temperature control, and use fast Fourier transform method and logarithmic power spectral density method to calculate and process the collected data. The voltage noise spectral density of the developed voltage reference in the 0.01 mHz～1 Hz band is obtained. The experimental results show that the spectrum density reaches 1.85×10-3 V/Hz1/2 at 0.01 mHz, and less than 4.89×10-4 V/Hz1/2 in the frequency range of 0.1 mHz～1 Hz. The development of this low noise voltage reference source and its noise evaluation provide a key device support in terms of laser intensity noise suppression in space gravitational wave detection.