The invention relates to a preparation method of cashew nut oil power grease. The cashew nut oil power grease is prepared from the following raw materials in parts by weight: 28-30 parts of cashew nut oil, 60-62 parts of corn glucose syrup, 1.5-2.5 parts of casein sodium, 0.8-1.2 parts of monoglyceryl ester, 0.3-0.6 part of sodium stearoyl lactylate, 1-2 parts of dipotassium hydrogen phosphate, 0.1-0.5 part of sodium tripolyphosphate, 0.1-0.3 part of calgon, 1-3 parts of cashew nut egg white, and 1-3 parts of skim milk powder. The preparation method comprises the following technology processes: mixing, stirring, homogenizing, spray drying and packing a liquid A composed of an oil phase (the cashew nut oil and the monoglyceryl ester), a liquid B composed of the corn glucose syrup, the skim milk powder, the sodium stearoyl lactylate and the dipotassium hydrogen phosphate and a liquid C composed of the sodium tripolyphosphate, the calgon, the cashew nut egg white and the casein sodium so as to obtain a finished product. According to the preparation method provided by the invention, the embedding rate is high, the surface is smooth, the heat stability and the storage stability are obviously improved, and the shelf life is prolonged.