The invention discloses a spiral electric grain sampler. The spiral electric grain sampler comprises an upper shell, a lower shell and a sampling barrel. A grip is fixed to the outer side of the uppershell. A battery is installed above the inner part of the upper shell. A driving motor is connected to the lower part of the battery. A transmission shaft is arranged below the driving motor. A baffle is fixed to the transmission shaft. An internal thread ring is fixed to the upper part of the outer side of the lower shell. A sample cavity is formed in the lower shell. A spiral blade penetrates through the lower shell and extends into the sampling barrel, and a key switch is fixed to the outer side of the upper shell. The spiral electric grain sampler is provided with the driving motor, the normal sampling work can be changed from the manual operation to the electric operation, and grains with larger size can be effectively subjected to sample extraction. Unlike a common hand-held grain sampler, a common sampling cylinder needle is changed into the spiral blade for conveying, and a sample can be directly conveyed and moved into the sample cavity. The spiral electric grain sampler enables the normal grain sampling work to be easier, and the sampling effect is more accurate.