The invention discloses a pediatric medical medicine crushing device capable of conveniently preventing medicine powder from being thrown out. The device comprises a base, a stand column, a reset spring and a hinge, wherein a groove is formed in one side of the base, the stand column is vertically installed at one end of the base, one side, close to the groove, of the stand column is provided witha pressing buckle in a vertical penetrating mode, a plastic spring is arranged at one end of the pressing buckle, the plastic spring is arranged at one end, close to the stand column, of a telescopicrod, the reset spring is arranged between the telescopic rod and the stand column, and the hinge is fixedly installed on one side, close to a collection box, of the stand column. According to the pediatric medical medicine crushing device capable of conveniently preventing the medicine powder from being thrown out, a sliding groove and a sliding block are arranged, a grinding device is rotated tobe taken down from the collection box, then the grinding device is turned upside down and shaken so as to make a sieve plate slide out through sliding between the sliding block and the sliding groove, then the sieve plate is taken down, in such arrangement, after the medicine crushing, the remaining medicine powder on the sieve plate can be washed off conveniently, so that the safety and sanitation of the device are improved.