The invention discloses a low-power comparator structure with an offset elimination function. The low-power comparator structure comprises a pre-preamplifier with an enable control end EN, a dynamic latch with a reset function, two capacitors and eight switches. When performing amplification for signal acquisition, the EN is a high level, and the pre-preamplifier works normally; once the acquisition is completed, signals are stored on the capacitors at the input end of the latch, the EN turns to a low level, and the pre-preamplifier is switched off; the input end of the pre-preamplifier is short connected before normal signal acquisition to store offset voltage; and during normal work, the input signals are acquired into the pre-preamplifier, the offset voltage is also eliminated, and then the signals enter the dynamic latch for comparison. According to the low-power comparator structure disclosed by the invention, the phenomenon that the state of the dynamic latch is determined before comparison can be ensured; and moreover, a high-threshold voltage tube is added to limit the current of the dynamic latch in the comparison process, the low-power design can be realized, the offset voltage is stored through the capacitors, and thus the offset elimination function can be achieved.