The utility model provides an explosive post suitable for moisture presplit blasting, its main points lie in it includes foam post, explosive, dead lever, foam post system has the hole, puts into the hole of foam post after the explosive interval is fixed on the dead lever together. The utility model has the advantages of as follows: 1, foam post parcel presplitting medicated roll can reduce downtheholely to be used in the explosion load on the pore wall when filling water, reduces the destruction to keeping the rock mass, 2, in horizontal presplit blasting, through the use of foam post, make the medicated roll center be close to big gun hole center, make precracking form, 3, the parcel of foam post has completely cut off the effect of water and explosive basically, has improved the stability of explosive property, simultaneously when the powder charge detonator and payment to a porter all by effectual protection, 4, the jam material is simple, conveniently acquires, can guarantee efficiency of construction and engineering effect.