This invention discloses a microporous quartz aerator, which comprises: an aeration plate, an outer jacket, an inner jacket, and an aeration pipe. The lower end of the inner jacket is fixed with an aeration joint, and its upper end is connected with the outer jacket. The aeration joint is connected with a unidirectional air valve. The planar or spherical aeration plate is fixed between the two jackets, and has honeycomb-like pore network inside. The aeration plate is produced by: mixing quartz sand 55-95%, high-temperature fluxing agent 5-45%, and adhesive (3-6 wt. % of quartz sand and fluxing agent), and calcining at high temperatures. The aeration plate has a porosity 30% higher than that of microporous corundum aeration plate, thus has such advantages as low wind resistance, large interface of gas and liquid, uniform bubble diffusion, adequate oxygen dissolution, no air hole blockage, good aeration effect, high wastewater purification quality, increased wastewater treatment efficiency by more than 5 times, good corrosion, acid and base resistance, no aging, and long service life.