The invention discloses a method for analyzing tantalum-niobium ore through a low-dilution ratio fused X-ray fluorescence spectroscopy. The method comprises the following steps: firstly designing a standard curve, preparing and fusing a standard sample, then determining instrument analysis conditions, correcting a matrix and spectral line overlapping effect, establishing an analytical method to simulate the validity of a raw ore and concentrate sample verification method and determining niobium, tantalum, titanium, silicon, iron, manganese, calcium, aluminum, sodium, potassium and tungsten inthe niobium-tantalum ore. A low-dilution ratio fused sample preparation method is used as a method for pretreatment in X-ray fluorescence spectrology analysis of the tantalum-niobium ore, and on the premise of ensuring the method sensitivity, a particle size effect and a mineral effect are eliminated; besides, the sample decomposition problem is also solved, and the hydrolysis of the niobium and the tantalum in an acid solution is avoided; the low-dilution ratio fused X-ray fluorescence spectroscopy method is more time-saving and labor-saving than a traditional method when being used for analyzing major and minor components in the tantalum-niobium ore; and the method has the advantages of being low in detection limit, wide in linear range, high in analysis speed and the like.