The invention discloses a method for preparing layered hydrotalcite-like powder. The method includes particular steps of preparing solution from bivalent hydrochloride and trivalent hydrochloride, adding alkali solution into the solution to obtain colloid, crystallizing the colloid at the high temperatures under the high pressures and taking out crystallized colloid to obtain hydrotalcite-like powder solution; delivering the powder solution into fractional cyclone hydraulic separators, adjusting the rotational speeds and acquiring hydrotalcite-like particle solution with certain particle sizes; carrying out gas dispersion and thermal gas flow and microwave heating drying atomization on the hydrotalcite-like particle solution to obtain high-dispersion powder; conveying the powder into multistage cyclone separators, adjusting the flow velocities and acquiring hydrotalcite-like powder with different particle sizes at the bottoms of the different cyclone separators. The method has the advantages that the shortcoming of stacking or aggregation or smashing of common layered hydrotalcite-like powder dried by evaporation can be overcome by the aid of gas dispersion drying processes, and the high-dispersion layered hydrotalcite-like powder with large surface areas can be prepared by the aid of the method; negative pressures can be regulated and controlled, accordingly, automatic feedingand drying can be carried out at the low temperatures, and the method is also applicable to thermo-sensitive substances; the method includes simple technologies and is extensive in application.