Ground height detection device, detection method, and harvester provided with ground height detection device

The invention provides a ground height detection device, a detection method, and a harvester provided with the ground height detection device. The ground height detection device comprises ground profile modeling components, corner amplification mechanisms, angle sensors and control units, wherein each ground profile modeling component comprises profile modeling modules and swinging arms, and the profile modeling modules and the swinging arms are independently symmetrically installed; each group of profile modeling module comprises a sliding plate, a first connecting rod and a second connectingrod, wherein each sliding plate comprises a sliding rod and a raised plate and is connected with one end of each first connecting rod, and the other end of each first connecting rod is connected withone end of each second connecting rod; the other ends and the middle positions of the two second connecting rods are independently rotatably connected through a rotation shaft II; each rotation shaftII is independently connec