The invention discloses a low-energy-consumption lifting mixing barrel. A mixing shaft is inserted into a barrel body, a motor and a reducer drive the mixing shaft to rotate, the mixing shaft is sequentially provided with a lower suspension spraying mixer and a bottom sweeping mixer from top to bottom, wherein the lower suspension spraying mixer is limited by an upper positioning step and a lower positioning step and can float up and down; the lower suspension spraying mixer comprises a mixing shaft, a shaft sleeve and a paddle, wherein the mixing shaft is a spline shaft, the shaft sleeve is also a spline shaft sleeve, the spline shaft sleeve can move on the spline shaft, and the paddle is welded on the spline shaft sleeve; the bottom sweeping mixer comprises a mixing shaft and an outer barrel, the mixing shaft and the outer barrel are welded into a whole by virtue of a paddle, the mixing shaft extends downward and forms a hollow cylinder, then the hollow cylinder extends to form a cone, and the outer wall of the cylinder is communicated with a jet pipe; and a blade tilt is gradually increased from top to bottom. The low-energy-consumption lifting mixing barrel has the characteristics that energy consumption is low, material circulation is good, deposition at the bottom is hardly caused, no mixing dead angle is formed, and light-load staring can be still realized even materials are sedimented due to long-time power failure, so that the low-energy-consumption lifting mixing barrel has a broad application prospect.