The utility model provides a top plate anchor rod rig, including landing leg and angle modulation device, angle modulation device includes first connecting piece and second connecting piece, and it is articulated that first connecting piece and second connecting piece pass through the horizontal rotary drum axle, and has the subtended angle that can change between first connecting piece and the second connecting piece, first connecting piece has the loading end that is used for setting up the rig, and the second connecting piece is connected with the top of landing leg, and the landing leg is along vertical direction setting, and the bottom of landing leg is supported in the bottom in tunnel, contained angle between the extending direction of loading end and landing leg between along with first connecting piece and second connecting piece relative rotation and change. The utility model provides a top plate anchor rod rig top of roadway board construction perpendicularly reduces empty apex distance, has increased roof support's reliability and security for this roofbolter can be applied to the drilling task in different angle tunnels, makes to be installed its supporting performance of stock full play in drilling.