The utility model discloses a movable building concrete mixing device, including feeder hopper, helical blade, box, transmission shaft, stirring vane and ejection of compact spiral, helical blade installs on the transmission shaft, the feed cylinder is installed in the inner chamber middle part position of box, is located the downside of transmission shaft, the main shaft is installed in the middle part position of box, lies in the positive center of churn, going out the feed cylinder and installing in the bottom position of box, internally mounted has ejection of compact spiral, ejection of compact spiral left end is installed in box zuo bi lower part position, connects through the bearing, the water pump is installed in the inner chamber middle part position of box, is located the top of churn, the raceway left end is installed on the water pump, and the right -hand member is installed on the churn, the workbin is installed on branch, the outer wall right side middle part position at the box is installed to the motor, the utility model has the characteristics of mix the stirring and portable of adding water again earlier, improved stirring efficiency, avoided simultaneously because the inhomogeneous phenomenon of the short stirring of churning time.