The invention belongs to the field of monitoring facility and relates to a road surface monitoring device, in particular to a monitor mounting structure capable of being mounted and adjusted rapidly.A fixed part is movably mounted at the top of a monitoring rod; a plurality of extending arms are mounted on the outer side of the fixed part at equal intervals; a monitor is mounted in each of the extending arms in a sliding manner; the relative position of the monitor and the corresponding extending arm can be adjusted and fixed; the fixed part comprises a top plate, a fixed head and a latch fastener device; the top plate is mounted at the upper end part of the monitoring rod in the horizontal direction; the fixed head is vertically mounted on the upper surface of the top plate; a clamping groove is formed in the outer edge of the fixed head; the fixed head is movably mounted on the latch fastener device through the clamping groove in a clamping manner; two extending arms are symmetrically mounted on the two sides of the external part of the latch fastener device; two sliding chutes are formed in the two extending arms in the extending directions; two sliding blocks are mounted in the two sliding chutes in a sliding manner; and monitors are mounted in the two sliding blocks.