The invention provides a water-saving irrigation device and method applicable to an irregular region. Through reasonable arrangement of sprinkler nozzles and real-time control over the elevation angles of the sprinkler nozzles, different sprinkling irrigation shapes can be formed in a sprinkling mode, and gapless complete coverage within a certain region is achieved. According to the water-saving irrigation device and method applicable to the irregular region, the problem that irrigation is limited in residential areas and agriculture and garden landscape because the distribution shapes of plants are irregular is solved, irrigation efficiency is improved, the irrigation cost is reduced, and the water-saving irrigation device and method applicable to the irregular region have important significance in quicker development of the agriculture and garden irrigation technology in China, and improvement of the modernization and intelligence level of the irrigation technology in China.