On-line automatic sampler for powder

The utility model provides an on-line automatic sampler for powder. The on-line automatic sampler for the powder comprises a speed regulation direct-current motor 1, a transmission mechanism, a main bearing seat 2, a spiral propeller 3, a spiral shell 4, a sample storage barrel 8, an electronic measurement scale 9, a PLC (programmable logic controller) 10 and an input and display unit 11, wherein the rotating speed, the working time, the stop time and the rotating frequency of the helix of the sampler can be adjusted at any time by utilizing the PLC; the time-variable, amount-variable and period-variable sampling can be realized, and the fixed-time, fixed-amount and fixed-period sampling can also be realized; the continuous, stable, high-efficiency, safe, scientific and accurate sampling can be realized.