The invention discloses a preparation method of red dates chip. The method comprises the following steps: 1) raw material treatment; 2) beating; 3) sizing; 4) starch gelatinization; 5) starch aging; 6) hot wind drying; and 7) microwave puffing drying. The preparation method of the red dates chip provided by the invention has the following advantages: red dates slurry is added with starch and subjected to microwave puffing to obtain a non-fried recombinant red dates chip with good formability and sensory quality; the method has great significance for development and utilization of fallen red dates and inferior red dates; cooking gelatinization and low-temperature rapid aging can effectively remove water in blank, so as to improve taste, brittleness and comprehensive sensory quality of the red dates chip; the red dates chip product can be prepared into a variety of shapes, has crispy taste, rich red dates flavor, dark red color, uniform and fine surface, good puffing effect and promising market prospect; the process has low energy consumption and high drying efficiency; and different dried fruits and nutlets are added in the sizing process to improve nutritional characteristics of a finished product of red dates chip.