The utility model discloses a bury formula tower crane funnel, the cylindrical discharge opening that includes a round platform shape hopper and locate the hopper bottom, be equipped with at least three sector in the discharge opening, every sector all is connected with the pole axle, and cylindrical discharge opening is worn out to the pole axle, and the portion is equipped with the pole axle sleeve at the pole off -axial, the epaxial recess that is equipped with of pole, the inside button that links to each other with the spring that is equipped with of pole axle sleeve, the button blocks the jail with the recess in the relevant position each other under the spring action. The utility model discloses a whole cross section of hopper is circular, and the diameter reduces extremely down from last gradually, and the round platform slope design of hopper makes the material unloading easier, has overcome the unsafe factor of multi -edged existence, the utility model discloses because of the existence of not having straight angle area, concrete and mortar are unloaded smoothly, no dead angle, the clearance of being convenient for. The design of discharge opening, steerable discharge rate and direction, light operation promotes the security of original hopper greatly, and the practicality is used manpower sparingly, the material resources financial resources.