The invention discloses a direct-current offset compensation method and a direct-current offset compensation device of a digital self-adapting mobile TV. The direct-current offset compensation method comprises the following steps: (1) resetting and initializing a radio-frequency receiving signal converted by digital/analog conversion in an accumulating way to obtain direct-current offset components; (2) judging if the direct-current offset components obtained in the step (1) needs to replace original direct-current offset components according to the fact that if the current operation is the operation for the first time after resetting, if an expected direction is opposite to an original direction and if an oscillating counter surpasses a threshold after plus 1; (3) judging a time accumulating direction for configuring the oscillating counter according to a marked original direction and outputting the direct-current offset components; and (4) eliminating the direct-current offset components obtained in the step (3) from the radio-frequency receiving signal. The invention solves the problem that the property of an integral receiving end is reduced because the property of the partialradio-frequency of the receiving end is poor.