The utility model discloses a railway ballast clearance mechanism, including profile modeling shovel, drive arrangement, interior plough and outer plough, set up drive arrangement on the profile modeling shovel, drive arrangement passes through connecting device and links to each other respectively with interior plough and outer plough, and the profile modeling shovel is provided with the recess with track matched with, plough in drive arrangement drive coupling device and then the drive and plough the motion outward, drive arrangement includes driving motor and electric putter, and the rotatory electric putter that drives of driving motor makes concertina movement, electric putter engaging lug seat, and the ear seat links to each other with connecting device, connecting device is first connecting rod and second connecting rod, and first connecting rod and second connecting rod are articulated with the ear seat respectively, first connecting rod is articulated with outer plough, and the second connecting rod is articulated with interior plough, interior plough is articulated with the profile modeling shovel respectively with outer plough. The utility model discloses on the placed track, move on making this mechanism way in orbit by thrust or pulling force, clearance railway ballast that can be convenient, convenient to use, and railway ballast clean up are favorable to one lower process - - - make the operation firm by ramming.