The invention provides ceramsite sand prepared through used sand regenerated waste. The sand is obtained through preparing of used sand regenerated secondary waste, and the raw material comprises waste ash and sewage, the waste ash is generated through an overheating method or mechanical method of resin sand, clay sand and the like, and the sewage is generated through wet method regeneration of sodium silicate-bonded sand. The invention further provides high-temperature-resisting precoated sand prepared through the ceramsite sand, the high-temperature-resisting property is good, and the heat expansion amount is low. The problem of secondary pollution formed through regeneration of current used sand can be solved, and zero emissions can be achieved.