The invention provides a compensating method of an OLED display. According to the method, when shutdown sensing is carried out, a compensating data control center controls a sensing module to sense the whole OLED display so as to obtain updating compensating data, then compensating data stored in a flash memory are updated by the updating compensating data, meanwhile, a data marker bit memory records the updating finished position of the compensating data in the flash memory, when the OLED display starts again, the compensating data control center can control the sensing unit to acquire the part of updating compensating data again if the time at which the compensating data in the flash memory are not updated, the sensing module acquires updating compensating data which correspond to the compensating data which are not updated and are written in a storage unit is shorter than a preset starting updating time, and the compensating effect is good.