The invention provides an intelligent stepless proportioning implementation method. High and low capacitance pressure sensors are installed in a pulping barrel in a grouting circuit, slurry and watersupply valves are installed on raw slurry and clear water inlet pipes, a micro controller is used to obtain a measured proportioning density and volume. A main control program for the real-time monitoring of a proportioning density is used, and with a program (time-based interval volumetric injection method), the obtainment of any volume of raw slurry or clear water with an allowable error range is achieved. The shortening of a water injection time process is also used to overcome the problem of the increase of a proportioning in a time slice method. The problems of unstable quality, a long time of technician training, high cost, easy falsification and the damage to project quality of traditional artificial proportioning are solved, tests prove that a measured slurry density is in a rangeof +/-0.03 g/cm3 of a set slurry density with the proportioning of the invention, setting parameters can be followed well, the method has strong anti-disturbance performance and can be well adapted toon-site proportioning requirements. Under the constraints of many factors of a proportioning and grouting system, the precise program control of the stepless proportioning is realized. The method canbe used in intelligent grouting engineering of hydropower stations.