The utility model discloses a laser measurement reflection target for monitoring arching deformation of a highway subgrade grouting pavement, which is characterized in that the laser measurement reflection target mainly comprises two linear slide rails, a sliding ruler block and a base, the two linear slide rails are vertically fixed on the base, and the sliding ruler block is arranged between thetwo linear slide rails through slide blocks on two sides; outer scale marks are arranged on the outer side of the linear sliding rail; the sliding ruler block comprises an upper liquid column and a lower liquid column which are coaxial and different in color, the upper liquid column is green, the lower liquid column is red, the two liquid columns are connected into a whole, a clear liquid level boundary line is arranged between the two liquid columns, and inner scale marks are arranged on the liquid columns. The device is matched with a laser emitting device for use, can monitor the arching deformation of the pavement in the highway subgrade grouting process, and has the characteristics of low cost, high efficiency, easiness in operation and the like.