Aiming at the problem that current conventional methods are difficult to accurately and real-time monitor the moisture content of construction waste recycled materials, through qualitative analysis of the macro and micro morphology and color characteristics of construction waste recycled materials, based on Matlab to extract the digital image characteristic value of materials and the correlation analysis of moisture content, the results show that, in addition to color,The correlation between the digital image characteristic parameters and water content of construction waste recycled material is significant.Linear regression analysis of characteristic parameters and water content was carried out by step method to fit the calculation model of water content of construction waste recycled material, and the test and field verification were carried out. The test results showed that the error of the calculation model of water content of construction waste recycled material was -0.2%~0.9% under laboratory conditions, and -3.0%~2.6% under field conditions.It can provide a method basis for the construction of automatic pulping system and the control of filling process based on construction waste recycling materials.