The invention discloses an ultra-low permeability sandstone reservoir low-resistivity reservoir well logging interpretation method and relates to the technical field of unconventional tight reservoir well logging interpretation evaluation. The interpretation method special for an ultra-low permeability sandstone reservoir low-resistivity reservoir is provided aiming at the defects that an existing well logging interpretation method is poor in adaptability to an oil-water poor-differentiation reservoir and low in interpretation accuracy and precision. According to the method, on the basis of relevant geological data and geological knowledge, by processing well logging information data and researching a proper method for determining the physical property lower limit and the electrical property lower limit of the reservoir, the ultra-low permeability sandstone reservoir low-resistivity reservoir well logging interpretation method is summarized; by means of the method, the accurate and reliable well logging interpretation result can be obtained, and well logging interpretation of the ultra-low permeability sandstone reservoir low-resistivity reservoir with the large reservoir oil-water resistivity difference and an obvious oil-water transition region can be achieved.