Image sensor and reading control method thereof

The invention provides an image sensor and a reading control method thereof, the image sensor comprises a pixel array and a row selection control line, the pixel array comprises a plurality of pixel units arranged in a Bayer array, part of the pixel units in the pixel array are set as focusing photosensitive pixel unit pairs, and the row selection control line is connected with the pixel units. Focusing control is carried out on the basis of the output value of the focusing photosensitive pixel unit in the focusing photosensitive pixel unit pair; the row selection control line receives the control signal and controls and selects the pixel units of the row needing to be read according to the control signal to read out the pixel signal; the row selection control lines comprise a first group of row selection control lines and a second group of row selection control lines; the pixel array comprises focusing pixel rows, the first group of row selection control lines are used for controlling non-focusing photosensi