In order to reduce the harm of noise to human body, it is particularly important to develop a kind of sound absorbing materials which is environmental, low manufacturing and high sound absorption coefficient in all frequency bands. The effects of blowing agent and air entraining agent on dry density, compressive strength and noise reduction coefficient of cement porous sound absorbing materials are studied. The sound absorption properties of cement porous sound absorption materials were compared with that of glass wool and rock wool. The tests show that the dry density and compressive strength of cement porous sound absorbing materials decrease with the decrease of the amount of air-entraining agent and the dilution ratio of air-entraining agent, the noise reduction coefficient of 0mm and 50mm cavities increase first and then decrease. When the cavity is 0mm , the peak value of sound absorption coefficient of cement based porous sound absorption material is 0.983 near 800Hz , the peak value of rock wool is 0.922 near 1000Hz , and the peak value of glass wool is 0.995 near 2000Hz . When the cavity is 50mm , the peak value of sound absorption coefficient of cement porous sound absorption material is 0.988 near 400Hz , the peak value of rock wool is 0.919 near 500Hz , the peak value of glass wool is 0.996 near 800Hz , and the noise reduction Coefficients are over 0.70.