Electro-geochemical extraction technique, as one part of the deep-penetrating geochemistry, has been widely used in the exploration for mineral resources and proved to be very useful. During the extracting process, it is critical that provide stable and continuous electricity power to the extracting electrodes. By now, it is still some problem remain to be solved. A kind of device called HD-2014 portable and multi-function electro-extraction is developed. It is 8.8 cm×8.8 cm×2.3 cm large and with a weight of 140 g. Four types of constant voltage output including 4.5 V, 6 V, 9 V and 14 V can be achieved using this device. And also, stable output of 10mA can be achieved. The extraction time can be set from 1 to 99 hours and the status can be showed in time. Test results acquired indoor and in field demonstrated that the maximum error of voltage and current are 1.38% and 0.60% respectively, which could assure the consistence of the electric field and current intensity.