The invention discloses an eMMC-based radar data recorder outage storage resuming method. The method includes: an initiating module initiates an eMMC chip controlled by a radar data recorder and outputs an initiation completion signal; a power-on self-test module receives the initiation completion signal, sets the detection step length of an address increment unit, performs the power-on self-test of the eMMC chip, sets instruction parameters and transmits the same to an instruction generator, transmits an acquired self-test operation instruction to the instruction bus of the eMMC chip, reads specific address data and performs detection, and acquires the final value of an illegal digit register; the output value of an address counter, the detection step length and the output value of a detection address counter are updated when the detected address is valid and judgement of the power-on self-test module is performed to obtain a final storage breakpoint address signal, the final storage breakpoint address signal is transmitter to a data transmission module, a self-test ending signal is transmitted to the data transmission module, and the eMMC chip is turned into a normal data transmission mode.