The invention provides a seat trolley, and belongs to the technical field of transportation tools. The seat trolley comprises a first seat body and a first moving assembly. The first seat body comprises a first seat plate and a first landing leg assembly arranged at the lower part of the first seat plate and used for supporting the first seat plate, and the side of the first seat plate or the first landing leg assembly is provided with a first connecting structure used for being detachably connected with the adjacent first seat body; the first moving assembly comprises a support connected withthe first landing leg assembly, a first power wheel assembly arranged on the support, and a power assembly with the power output end connected with the first power wheel assembly and used for drivingthe first power wheel assembly to move. The seat trolley can be used for carrying test piece samples, can be used as a seat and placed in an office or other places for use when not needing to carry test piece samples, no much space is occupied, and environment cleanliness and attractiveness are facilitated; and meanwhile one or more seat trolleys can be connected together through the first connecting structure, and the loading capacity for the test piece samples is greatly improved.