The invention discloses a preparation method of chickpea powder. The chickpea powder is prepared from chickpeas which are subjected to finely selecting and deodorizing pretreatment; technological conditions of preparing the chickpea powder by virtue of an electromagnetic puffing process and a differential pressure puffing process are optimized through an orthogonal method; chickpea moisture mass percentage, electromagnetic puffing power and electromagnetic puffing time which result in relatively significant influence on the quality of the chickpea powder are selected as independent variables; orthogonal analysis is carried out by taking the puffing rate of the chickpea as an index; obtained optimal technological parameters of electromagnetic puffing are as follows: puffing power is 450W and puffing time is 14S; and obtained optimal technological parameters of differential pressure puffing are as follows: puffing temperature is 110 DEG C, vacuumizing temperature is 100 DEG C and vacuumizing time is 2h. Results show that the chickpea powder prepared by the invention is good in palatability, good in water solubility, free from oil and any additive, low in energy consumption during preparing, and capable of achieving industrial continuous production, and has realistic significance.