A lime powder laying device. The thickness of lime laid on a highway can be adjusted by adjusting the thickness of lime output on a conveying belt (6), the lime output speed, and the running speed ratio of a frame (1). Under the combined action of two adjusting modes, the adjustable range of the laying thickness of the lime is large. The two adjusting modes are linked together to perform adjustment. The scale of the laying thickness of the lime powder on a dial (16) is determined according to the adjustment of the transmission ratio and the height of a thickness baffle plate (7). Therefore, the effect of accurately adjusting the laying thickness of the lime powder can be achieved. Moreover, since both the thickness baffle plate (7) and the speed ratio are adjusted in a stepless manner, the lime laying thickness accuracy is guaranteed. The adjustability is strong. The two adjusting modes are alternately carried out by using a power shaft (13) so that the linkage is good, and the adjustment is simple and convenient.
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