The integrated detector and calibrator was designed to improve detection efficiency of laser designator. The device applied large diameter folded back type parallel light tube and semi inverse semi permeable mirror to design optical path, and utilized optical path splitting technology, CCD imaging technology and laser quantitative measurement technique to detect the laser energy, beam divergence angle and optical axis parallel at the same time, and used digital image reconstruction technology to assistant on-line calibration for optical axis parallel. The results show that the device improved the accuracy and security of optical axis parallelism detection, and it could detect and calibrate the laser designator safely, quickly and accurately. The device conform to the requirement for integrated equipment.