The invention belongs to the field of radioactive geophysical exploration in uranium exploration and particularly discloses a radioactive exploration method for characterizing deep sandstone type uranium mineralization information. The radioactive exploration method comprises the following steps: selecting an exploration work area and designing a work area measuring grid; calibrating a gamma energy spectrum measuring system and an activated carbon radon measuring instrument; determining the position of a measuring point on site; measuring the measuring point to obtain the content of uranium U in surface shallow soil; measuring the measuring point to obtain a concentration value of radon Rn; respectively interpolating the U and the Rn into U-0 and Rn-0, sliding the U-0 to averagely generate U-1, sliding the Rn-0 to averagely generate Rn-1, dividing the Rn-1 by the U-1 to generate K-0 and then multiplying the K-0 by the U-0 to generate Rn', wherein the Rn' is calculated radon concentration; dividing the Rn-0 by the Rn' to generate radon concentration and calculated radon concentration ratio raster data R; delineating a deep uranium mineralization information favorable area according to the R. According to the method, the surface information interference can be effectively pressed, and a deep sandstone type uranium mine can be rapidly and directly explored.