The invention relates to ceramic fibers, in particular to a ceramic fiber resistivity testing method. Multiple ceramic fibers are parallelly bonded to a metal plate sample table through double-sided adhesive tapes; the fibers are parallelly connected through silver conductive adhesive; after the silver conductive adhesive solidifies, a fiber sample and the metal plate sample table are put in a metal electromagnetic shielding box; the metal plate sample table, an electrometer for testing circuit current and a digital source meter providing test voltage are connected in series; under the constant-temperature constant-humidity condition, a micro current test is performed; after one current value is measured, voltage output of the digital source meter is closed; the metal electromagnetic shielding box is opened, one fiber is torn off, and corresponding micro current of the remaining parallel fibers is continually measured until that the current of the different fibers is all tested; resistivity values of the multiple groups of fibers different in quantity are solved according to the ohm law and a volume resistivity formula, and a statistical average is acquired. The problem that high resistance of the fine-diameter ceramic fibers cannot be accurately measured can be effectively solved.