The invention discloses a soil-cement mixer capable of dumping safely. The soil-cement mixer comprises a base, a mixing tank, a mixing drum and a driving motor; two tripods are fixed to the base; twohydraulic supporting devices are fixedly arranged in the center positions, located on the two sides of supporting rods of the tripods, of the base correspondingly; and the mixing drum is in a symmetrical cone shape, and comprises buffer slots, drum shaft ends, drum walls and mixing bulged teeth. With the adoption of the mixing drum in the symmetrical cone shape and by matching with the special-structure mixing bulged teeth and inclined walls on the mixing drum, the situation that soil-cement is wholly stacked at the bottoms of the inclined walls and thus cause blockage in the mixing process can be avoided; and the mixing tank is hinged to the tripods and is matched with the two hydraulic supporting devices opposite in movement directions, so that the discharging of the soil-cement can be more convenient and safe. The mixer can mix the soil-cement intensively uniformly, the probabilities of agglomeration and blockage are low, the dumping is facilitated, and the working efficiency is improved fully.