Abstract: Based on the combination of theoretical analysis and experimental research, the research on coalbed methane low density composite cement-based cementing materials was systematically carried out. Firstly, the characteristics of coalbed methane cementing and the commonly used low-density cementing slurry system are analyzed. The “hydration synergy effect” based on the combination of oil well cement and sulphoaluminate is proposed. The hollow glass microbeads are used as the reducing agent and sodium gluconate as the retarder, a new idea of low-density composite cement-based cementing materials is developed. Then, the oil well cement and sulphoaluminate cement are compounded according to different proportions to study the fluidity, setting time and pumpability of the composite slurry. Basic properties such as period and compressive strength determine the basic formula of composite cement slurry. On this basis, the effects of different amounts of hollow glass microspheres and sodium gluconate on the properties of the base formulation were analyzed, and then the optimized formula of low-density composite cement-based cementing materials suitable for coalbed methane cementing was developed. Finally, the main performance of the optimized formulation is evaluated. The results show that the low-density composite cement-based cementing materials studied have the characteristics of low slurry density, good fluidity, controllable coagulation time, fast and hard, early strength, and environmental protection.