The invention relates to the technical field of soil sampling, and discloses a layered sampling device and method for contaminated soil in a temporary storage warehouse. The device comprises a mounting plate, and a support is fixedly connected to the upper surface of the mounting plate; a driving motor is fixedly connected to the inner side of the support, a rotating shaft is fixedly connected tothe output end of the driving motor, and a driving gear is fixedly connected to the bottom end of the rotating shaft. According to the invention, the layered sampling device is provided with the driving motor, so when the contaminated soil needs to be sampled, an external power supply starts the driving motor to drive the rotating shaft to rotate, the rotating shaft rotates to drive the driving gear to rotate, the driving gear drives the driven gear to rotate so as to drive the drill rod to rotate, the drill rod rotates to drive the drill bit to rotate, the drill rod and the drill bit rotate,and under the matching action of a spiral part, the device is held by a hand to drill holes into soil, so soil feeding is more convenient, and the soil is simpler and more convenient to use in the subsequent collection process.