Tunnel blasting excavation tunnel face flatness measuring device and using method

The invention discloses a tunnel blasting excavation tunnel face flatness measuring device and a use method. A laser detection device is used for emitting laser signals to different measuring points of a tunnel face and receiving the laser signals reflected by the different measuring points; the processor is used for determining the distance between each measuring point of the tunnel face and the corresponding laser transmitter according to the time difference of transmitting the laser signal and receiving the laser signal; determining a concave-convex degree evaluation index, a horizontal coordinate and a vertical coordinate of each measuring point of the tunnel face according to the distance between each measuring point of the tunnel face and the corresponding laser transmitter; according to the concave-convex degree evaluation index, the maximum concave point and the maximum convex point are selected from all the measuring points of the tunnel face, the vertical coordinate difference, the horizontal coordi