The Altun metallogenic belt is an important lithium metallogenic belt, and in recent years, 9 Li-Be deposits above medium size and 11 Li-Be mine sites have been discovered in Washixia South, Tugman, Tamuqie. Two rare metal metallogenic sub-belts in the south and north have been defined, which has good prospect for finding minerals; however, the working conditions of this belt are harsh, and the degree of geological work is low. it has the importance of the area of great breakthroughs in the search for Li-Be mines. This paper adopts the "Satellite-UAV- Spectroscopy" remote sensing three-dimensional survey methodology and technology, co-operating with ground infrared spectrometer, unmanned aerial vehicle (UAV) hyperspectral and satellite remote sensing technology, sampling multi-spectral remote sensing to identify the rock body and stratum on a small scale of 1:200000-1:50000, and superimposed geochemistry to carry out the selection of Li-Be prospecting area; In the prospecing area, high-resolution remote sensing images are sampled to identify pegmatite veins on the scale of 1:10,000 to define the target area for mineral exploration; and UAV hyperspectral data is used to differentiate the Li-Be-bearing pegmatites on the scale of 1:5000 to achieve rapid and efficient positioning of Li-Be pegmatite veins. This paper shows that the " Satellite-UAV- Spectroscopy" remote sensing three-dimensional survey method is very suitable for the ore-bearing pegmatite veins in Altun Mountain by comparing with the measured ore-bearing pegmatite veins in the field. The problem of integrating "map" with "spectrum" in large-scale mineral mapping is solved and the precise positioning of Li-Be-bearing pegmatites is achieved.