According to a plant fiber concrete column, plant fiber concrete is added on the basis of an original column, the dead weight of a wall can be reduced, and the effects of heat preservation and heat insulation can be achieved. Supporting ribs are arranged in an area where the plant fiber concrete is poured and longitudinally penetrate through the whole column structure, the defect that the plant fiber concrete is low in strength is overcome, a center concrete column is welded into a nine-square frame through snowflake plates, and the bearing capacity of the concrete column is improved. And theplant fiber concrete plate is arranged outside the central concrete column, so that not only can the cold bridge phenomenon be avoided, but also the thermal bridge phenomenon can be effectively prevented, and the thermal insulation effect is more remarkable. A protrusion and a groove are formed in the top and the bottom of the center concrete column respectively so as to assemble the adjacent plant fiber concrete columns, and four concrete slabs are spliced end to end, fixed through magnets and then connected through bolts for secondary fixing. The structure is convenient to disassemble, a large amount of manpower is saved, and the disassembled concrete slabs can be reutilized.