The invention discloses a device for a direct-current and impulse superposition voltage test in high-altitude regions, which is formed by successively connecting an impulse voltage generator (1), a high-voltage isolation capacitor (2), an impulse voltage measuring system (3), a test object (4), a high-voltage protection resistor (5), a direct-current voltage measuring system (6), a limiting current protection resistor (7) and a direct-current voltage generator (8). In the device, output voltage is a superposition voltage mode characterized by direct-current superposition impulse; an input direct-current voltage component and an impulse voltage component can be respectively and independently regulated; the superposition voltage waveform under different direct-current voltage components and impulse voltage components can be output according to requirements; and the device has the obvious advantages of small impact on the waveform of the superposition voltage and good impulse conducting capability.