Aiming at precision measurement in the manufacture process of carbon fiber reinforced composite reflector mold,an in-situ measurement technology based on robot and laser tracking three-dimensional measurement system was studied. Each unit in the in-situ measurement system was correlated by measuring trajectory planning and coordinate frame transformation, the continuous motion of the two systems could be followed to complete the automatic and efficient sampling of point clouds on the mold surface.On this basis,the parabolic surface accuracy evaluation algorithm is studied,and the best fitting between the measurement points and the theoretical model was realized, thus the values of the mold surface accuracy were obtained.The results show that the measurement efficiency is greatly improved by using the in-situ measurement technology,and the numerical and graphic results of the surface accuracy can assist the efficient modification of the mold.