The spring tines of agricultural machinery are bow-shaped tines made of spring steel sheets, which are elastic during operation. Suitable for grassland and pasture renewal, it can plan weed roots out of the ground. In the combined soil preparation machine used for wheeled tractors, the spring tooth harrow with spring tines is hung between the soil leveling shovel and the soil breaking roller, and the reasonable structure arrangement with other accessories makes the soil preparation machine do not turn the soil during operation.