Provided are a parallel near-infrared photoelectric sensing device and a system and method for detecting organs and tissue of animals. The parallel near-infrared photoelectric sensing device and the system and method for detecting the organs and the tissue of the animals can be applied to detection on the degree of blood oxygen saturation and concentration and variable quantity of the concentration of photoactive substances of skin, lymph, external genitals, prostate glands, brains, mammary glands, urinary bladders and other organs and tissue needing multiple depth levels or having physiological shifting. The parallel near-infrared photoelectric sensing device is characterized by comprising a sensing component distributing surface, a light source signal emitter array and an optical signal receiver array are arranged on the sensing component distributing surface, the light source signal emitter array comprises an emitter unit composed of at least two light source signal emitters, the optical signal receiver array comprises a receiver unit composed of at least two optical signal receivers, and the emitter unit and the receiver unit are arranged on the sensing component distributing surface in parallel or in a staggered mode.