The invention belongs to the field of uranium resource exploration, and particularly relates to a geo-electrochemical method and a geo-electrochemical device for sandstone-type uranium deposit exploration. The device comprises a polyurethane foam for information extraction, and further comprises a carbon fiber rod, a wire and a small ring. The carbon fiber rod is inserted into the polyurethane foam by arranging a notch in the surface of the polyurethane foam. The carbon fiber rod is connected with the wire through the small ring, and the wire is connected with an external power supply. The method of the invention comprises the steps of arranging measuring points, installing a measuring device and recycling the measuring device. By adopting the method and the device of the invention, deep concealed sandstone type uranium mineralization information can be accurately identified.