The invention discloses a method for determining total organic carbon in pulveryte. The method includes: acquiring total organic carbon of a core sample of a key well; acquiring a first-type well-logging parameter value of and a second-type well-logging parameter value of the core sample, wherein both the first-type well-logging parameter value and the second-type well-logging parameter value belong to tri-porosity well-logging information; building delta X-Y of the key well according to the first-type well-logging parameter value and the second-type well-logging parameter value, wherein X refers to a first-type well-logging curve, Y refers to a second-type well-logging curve, and delta X-Y refers to a distance between the first-type well-logging curve and the second-type well-logging curve; building a quantitative relation function between the delta X-Y and the total organic carbon; calculating total organic carbon of a non-coring well according to the quantitative relation function. By the method, the technical problem that existing technical schemes are low in accuracy of determining organic carbon content in pulveryte is solved; compared with existing delta lgR methods, the method has the advantage that accuracy of determining TOC (total organic carbon) can be improved.