Aiming at the problems of large calibration error,low accuracy and complex calibration process in traditional robotic arm vision system calibration method,a hand-eye calibration method for digital twin was proposed.By analyzing the calibration principle,the calibration method was given and a twin virtual platform for robotic arm was built to realize data interaction in virtual and real space.The results show that： the proposed hand-eye calibration method has the advantages of high grasping precision and good grasping performance.