Disclosed is a sand mixer, comprising a machine base (1), a mixing device connected to the machine base, and a sand feeding hopper (2) and a water spray device (6) connected to the mixing device, wherein the mixing device comprises a sand conveying and mixing mechanism (3) and a final mixing mechanism (4), a first end of the sand conveying and mixing mechanism is connected to the sand feeding hopper, and a second end of the sand conveying and mixing mechanism is connected to the final mixing mechanism; the outside of both the sand conveying and mixing mechanism and the final mixing mechanism is sheathed with a temperature control cylinder (5), a gap for introducing a temperature control medium is provided between the temperature control cylinder and the sand conveying and mixing mechanism and between the temperature control cylinder and the final mixing mechanism; and the water spray device is respectively in communication with the sand conveying and mixing mechanism and the final mixing mechanism. A sand mixing process is further comprised. The sand mixer realises continuous sand mixing, and effectively controls the temperature of sand and the internal humidity, thereby improving the sand mixing efficiency and the performance of mixed sand.
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