The invention provides a process for preparing pectinose from pea pods used as raw materials. The process comprises the following steps: preprocessing the raw materials, performing primary hydrolysis to extract hemicellulose, and performing secondary hydrolysis to extract pectinose. According to the process, a pectinose liquid obtained by adopting the process of extracting pectinose by virtue of two-step acid hydrolysis does not need to be filtered by virtue of an ultrafiltration membrane, a high-purity pectinose hydrolysate can be obtained by adopting a process of decolorizing in one step, desalting, refining and concentrating only, the operation is simple, and the production cost is reduced; in addition, the product quality can be remarkably improved by adopting the process.