Low detonation velocity powdery emulsifying explosive

The invention relates to a powdery emulsion explosive with low detonation velocity. A rock powdery emulsion explosive, talcum powder and coarse bran are placed into a mixer for fullly stirring to ensure that the mixture is mixed evenly and then is packaged and sold, wherein the bulk density of the rock powdery emulsion explosive is between 0.58 and 0.62/g.cm, the detonation velocity is between 3,500 and 3,700/m.s, the brisance is between 15 and 17/mm, the sympathetic detonation is between 9 and 11/cm, the capacity for work is 360/ml, and the storage period is 6 months; the bulk density of the talcum powder is between 0.95 and 1.0/g.cm, and the grain diameter is 300 meshes; and the bulk density of the coarse bran is between 0.28 and 0.35/g.cm, and the grain diameter is between 0.8 and 1mmr. In the invention, the powdery emulsion explosive with low detonation velocity is applied to double metal explosive welding first, which ensures the quality of explosive welding of double metal explosive comp