The invention belongs to the technical field of power and electronics control, and relates to a power supply device in the direct current electric exploration technology applied to the field of uranium ore resources and environment exploration. The power supply device comprises an accumulator, a solar battery component, an inversion controller and the like, wherein the inversion controller uses an STC single chip as a core and converts the electrical energy of the accumulator into alternating current staircase voltage to be output and supplied to the high-voltage electrode on a mind field, the frequency of the output voltage can be switched and changed in five levels, and the single side value of the output voltage can be switched and regulated in ten levels. The invention uses the solar photovoltaic generating technology to provide power supply, uses the single chip and a CAN communication module to realize the intellectualization and networking of the power supply control device, uses the inversion technology and the frequency conversion technology, uses the PID algorithm, carries out remote switching through an upper computer and a CAN bus network, has multi-frequency and multi-voltage optional output, has the characteristics of safety, high speed, high efficiency, stability and reliability, and provides much convenience for the workers conducting electric exploration of field uranium ore resources and other mineral resources.