Globally, water scarcity demands immediate attention, particularly in arid regions like Northwest China, necessitating efficient water use strategies in crop cultivation. Quinoa (Chenopodium quinoa Willd.), celebrated for both its drought tolerance and nutritional value, has consequently emerged as a central focus in contemporary agricultural research seeking solutions to this challenge. To explore the effects of different irrigation amounts on quinoa yield and water productivity, a mulched drip irrigation technique was applied in community trials of quinoa in Mulei County in 2020 and in Bole City in 2021. The "JL-1" quinoa variety was used as the experimental material, and four irrigation levels were set (255 mm, 292 mm, 330 mm, and 367 mm). This study examined the impact of varying irrigation amounts on quinoa growth indicators, like plant height, stem diameter, leaf area index, aboveground biomass, and yield, and analyzed water productivity. The results from two years of trials indicated that different irrigation gradients had significant or extremely significant effects on quinoa growth indicators. The maximum values of growth indicators were achieved under the highest irrigation level of the control treatment. Water production rates in the 2020 trial in Mulei were highest at an irrigation amount of 330 mm, while in the 2021 trial in Bole, the highest water production rate was observed at 292 mm. Across the two years of trials, when the irrigation amounts were the same prior to the heading stage, the differences among all treatments were not significant, whereas varying irrigation gradients had a significant impact on growth after the heading stage. Furthermore, the growing environment significantly affected the quinoa yield; in the Bole trial, strong winds in the mid-growth period led to severe lodging of quinoa. The findings suggest that managing irrigation amounts, specifically by appropriately increasing irrigation during the water-sensitive stage of quinoa (from heading to grain filling) and reducing water during the early growth stage, can control the growth in quinoa height, thereby improving yield while conserving water resources.