The invention provides a blasting cartridge mounted with a directional blasting mechanism. The blasting cartridge comprises a blasting cartridge body, a slide plate and a rubber pad layer and is characterized in that the six outer-wall end faces of a plastic shell are either provided with concave slide grooves or connected with plastic protruding blocks; the rubber pad layer is adhered to the inner end face of the plastic shell. The blasting cartridge has the advantages that the three outer-wall end faces of the plastic shell are provided with the concave slide grooves, a weighing sensor can be slidably connected into one concave slide groove in the outer wall of the plastic shell through a protruding structure at the top of the slide plate adhered to the top of the weighing sensor, the quantity of explosives added into the blasting cartridge body can be detected favorably by an external display device connected to the weighing sensor after the explosives are added into the blasting cartridge body, accurate explosive quantity of the blasting cartridge body is guaranteed, and the requirements of directional blasting can be satisfied.