The invention provides a mountainous area waste residential land reclamation method. The method comprises the following steps: (1) smashing adobe waste residential land, and refilling into original waste residential land; (2) flattening a backfilled place; (3) building auxiliary facilities, namely, forming grooves, ditches and roads in a reclamation area in order to ensure a good ploughing condition; (4) performing chemical analysis on soil organic matters sampled from the land treated in the step (3); (5) when the organic matter content is analyzed to be less than or equal to 10g/kg, adding lime into the land to adjust the pH of soil, and planning alfalfa; when the organic matter content of soil is greater than or equal to 30g/kg, applying an organic fertilizer to the land. By adopting the method, the waste adobe residential land in mountainous areas can be effectively reclaimed into farmland, the land utilization ratio is increased, intensive economical utilization of rural land is realized, the ploughing area is increased, and the village landscape is improved.