The utility model relates to an agitating unit and chain formula grooving machine relates to piled driving machinery technical field, for the problem design of solving current chain formula grooving machine stirring effect difference and one -tenth wall inefficiency. This agitating unit includes at least one chain drive unit, is used for to drive a power pack of chain drive unit's drive sprocket motion and set up the stirring sword tooth on chain drive unit's driving chain, wherein, and drive sprocket and the pin joint of protection casing inner wall to be provided with chain wheel bearing device between drive sprocket and the driven sprocket. The utility model provides an agitating unit is used in among the chain formula grooving machine for the stirring of realization mixing water mud in to the foundation ditch.