The invention relates to a fluid identification method applicable to a compact sandstone reservoir. With the adoption of the method, for the difficulty in phase attribute identification of the compact sandstone reservoir, on the basis of a cumulative distribution curve of the apparent formation water resistivity of the reservoir, the ratio of the apparent formation water resistivity Rk1 corresponding to a first cumulative frequency percentage to the apparent formation water resistivity Rk2 corresponding to a second cumulative frequency percentage is calculated to be used as the non-uniform coefficient of the apparent formation water resistivity of the reservoir, and the correspondence between phase attributes and the non-uniform coefficient of the apparent formation water resistivity of a known reservoir is established, so that phase attributes of the to-be-explained reservoir are identified by the aid of the non-uniform coefficient of the apparent formation water resistivity of the reservoir. The new method is provided for phase attribute identification of the compact sandstone reservoir.