Video speed measuring device with good dustproof performance

The utility model discloses a video speed measuring device with good dustproof performance. The device comprises a shell with a circular section, a downward camera is arranged at the bottom of the shell; a hemispherical transparent dustproof cover is arranged at the periphery of the camera; a dust removal mechanism is arranged at the bottom of the shell and located on the periphery of the transparent dustproof cover. The dust removal mechanism comprises a positioning block which is arranged at the bottom of the shell and is of an annular structure; an annular mounting groove is formed in the positioning block; air outlet nozzles distributed along the periphery of the transparent dustproof cover are arranged at the bottom of the positioning block, an annular air pipe is arranged in the annular mounting groove, air outlets corresponding to the air outlet nozzles in a one-to-one mode are formed in the bottom of the air pipe, air inlets are formed in the air pipe, and a micro air pump anda dust filtering cylinder