The invention discloses a wafer and solar cell photoinduced carrier radiation phase lock imaging detection method and system. The system comprises a near infrared camera, a signal acquisition card, a computer, a three dimensional mobile platform, a long pass filter plate, a first laser device and a second laser device, wherein a sample piece being detected is fixed on the three dimension mobile platform, the three dimension mobile platform is adjusted so as to make the sample piece being detected be clearly visible in a visual field of the near infrared camera, the computer controls the laser devices to subject the sample piece being detected to optical excitation operation by controlling signal acquisition card, the near infrared camera is controlled to be synchronously triggered to collect image sequences, the image sequences collected by the near infrared camera are sent to the computer and then subjected to phase lock processing operation, and therefore high signal to noise ratio carrier radiation signal imaging can be realized. According to the wafer and solar cell photoinduced carrier radiation phase lock imaging detection method and system, the sample piece is excited by laser light in a surface excitation manner, large area can be detected and high detection efficiency is realized, a phase lock algorithm is adopted, good detection results can be obtained in natural light background without darkroom environment, and convenience of detection is realized.