The invention relates to a mixing system and method, in particular to a building cement stirring mixing system and method. The system comprises a whole support, a mixing support, a pushing mechanism,a mixing cylinder, a swing support, a power mechanism, a planetary mechanism, a stirring mechanism, a lifting screw, a water inlet mechanism and a sliding support; through the power mechanism, the mixing support and the stirring mechanism are driven at the same time to rotate at the same time, the mixing support and the stirring mechanism are opposite in rotation direction to mix and stir the cement raw material in the mixing cylinder, the pushing mechanism is combined for pushing the mixing support to swing, due to the fact that centrifugal force generated by rotating of the mixing support and the stirring mechanism has the tendency of pushing a cement raw material mixture to the outer side, when the pushing mechanism pushes the mixing support to swing, the gravity center of the cement raw material mixture is repeatedly changed, the cement raw material mixture is prevented from being stacked on the outer ring in the mixing cylinder, and the mixing and stirring effect is improved.