The invention relates to and provides a networked speed measuring device with an automatic floating dust removing function. The networked speed measuring device comprises a main seat, and the outer side of the main seat is fixedly sleeved with a rotary disc. Pin rollers are movably placed in the main seat, and a roll
brush is mounted between one pair of pin rollers. A tooth plate engaged with a gear is movably inserted into the main seat, and an
electromagnet is fixedly mounted below a magnetic block. A
resonance sheet is mounted in a
resonance cavity, a shifting rod is fixedly connected witha baffle, a ball is p laced at the top of the baffle, and a switch is mounted on the bottom wall of a dropping groove. when a car passes, the
resonance sheet vibrates to drive the baffle to shake, andthe ball is jacked at the upper end of a sliding groove by the baffle all the time; when no car passes, the resonance sheet stops vibrating, the ball drops along with the dropping groove and touchesthe switch, the
electromagnet is powered on and has
magnetism, a rotary shaft and a rotary disc are driven to rotate, and the pin rollers with the roll
brush are jacked upwards; and after a mirror surface of a camera is cleaned by the roll
brush, the roll brush moves into the main seat again, and shooting is prevented from being influenced.