Crosstalk preventive image sensor

The invention discloses a crosstalk preventive image sensor. The image sensor comprises a pixel structure array of a substrate and leads formed on the substrate. Each pixel structure comprises a photosensitive unit and a deep photodiode which is arranged surrounding the photosensitive unit and isolated from the photosensitive unit, the N pole of the deep photodiode is connected with the lead, and the deep photodiode is used to receive photocarriers overflowed by the photosensitive unit and remove the photocarriers via the lead. The image sensor uses the deep photodiodes to isolate the photosensitive units, the preparation difficulty of the deep photodiode is lower than that of a traditional shallow trench isolation structure, and thus, the image sensor is easier to realize and good in the isolation effect.