Refillable multi-pulse solid rocket engine

The invention relates to a refillable multi-pulse solid rocket engine, comprising: a combustion mechanism comprising a combustion chamber, a spray pipe, an ignition needle, a nose and a nose sleeve, the nose and the nose sleeve being capable of moving along a first direction parallel to the axis of the spray pipe; the medicine supply mechanism comprises a medicine storage box, a medicine supply cam, a movable clack and a lifting mechanism, the medicine storage box is fixed to the fixing component, the medicine supply cam can move in the axial direction, and the lifting mechanism can move in the second direction perpendicular to the first direction; the lifting mechanism can ascend and descend in the third direction perpendicular to the first direction and the second direction at the same time. The medicine collecting mechanism comprises a medicine collecting cam and a medicine collecting box, and the medicine collecting cam and the medicine collecting box can move in the second direction; the locking mechanis