The invention discloses zinc-containing layered potassium titanate plate-shaped particles and a hydro-thermal preparation method thereof, which belong to the field of material preparation. The method comprises the following steps: adding TiO2 and Zn(NO3)2.6H2O in a KOH aqueous solution, stirring the materials and uniformly mixing the raw materials, performing a hydro-thermal reaction on a mixture, after the reaction is completed, and performing steps of filtering, washing, and drying to obtain the zinc-containing layered potassium titanate plate-shaped particles. The composition expression of the plate-shaped particles is K0.8Zn0.4Ti1.6O4, the length is 1-2 [mu]m, and the thickness is 100-200 nm. Compared with a traditional solid phase method and a molten salt method, the particle size of the prepared layered K0.8Zn0.4Ti1.6O4 plate-shaped particles is small, the purity is high, and the morphology and microstructure are controllable, the preparation technology is simple, the energy consumption is low, the repeatability is high, and the preparation method is in favor of industrial production.