Walking type steel rail surface roughness scanning trolley

The utility model provides a walking type steel rail surface roughness scanning trolley, which is characterized in that a first-stage supporting vibration reduction structure is arranged between a supporting plate and a wheel body, an operation window is arranged on the supporting plate at the position corresponding to a steel rail, a box body with an opening at the bottom is arranged at the operation window, the box body is fixedly connected with the supporting plate, and a second-stage supporting vibration reduction structure is arranged between the box body and the supporting plate. A power piece used for driving the laser detection assembly to move upwards to be stored in the box body or move downwards to be right opposite to a steel rail is arranged in the box body, and the laser detection assembly comprises an arch-shaped frame with an arch-shaped face arranged downwards and a linear laser scanner arranged along the arch-shaped face of the arch-shaped frame. Two protective covers are rotatably and symme