Preparation device of civil triaxial sand sample

The invention relates to the technical field of sand sample preparation devices, and discloses a civil triaxial sand sample preparation device which comprises a bottom plate, and a uniform mixing mechanism, a material conveying and sampling assembly and a sealing preparation mechanism are arranged at the top of the bottom plate. According to the preparation device for the civil triaxial sand sample, in the use process, sandy soil is poured into a mixing tank body through an arranged uniform mixing mechanism, at the moment, a first motor is driven to enable a one-way threaded rod to rotate, a lifting plate is limited by a first sliding limiting rod, a top cover covers the exterior of the mixing tank body, a second motor is driven, and the sandy soil is poured into the mixing tank body; after material mixing is finished and a top cover ascends, an electric push rod and a rack are driven to drive a gear to drill under the limitation of a sliding limiting rod II, so that the uniformly-mixed sand in the mixing tan