The invention discloses a pharmaceutical solid reagent dissolving device which comprises a dissolving tank body, wherein a pulverizing device is arranged on the dissolving tank body and is used for pretreating a solid reagent, so that the labor intensity of an experimenter in a subsequent dissolving process is relieved; a pair of cylindrical gears is arranged in the pulverizing device and fixed in the pulverizing device through vertical columns; a vibration plate is arranged in the dissolving tank; two groups of stirring blades and a temperature sensor are arranged on the vibration plate; the stirring blades are connected with a servo motor. By the adoption of a scheme of a heating net, the experimenter can use medicines conveniently, and extra heating is not required; three liquid outlets are provided, with different flowing speeds, so that the experimenter can select the liquid outlet and extract liquid conveniently; the whole device is easy to set and convenient to operate; the labor intensity of the experimenter can be greatly alleviated, and the dissolving efficiency and the dissolving effect of the reagent can be improved; compared with the conventional dissolving mode, the pharmaceutical solid reagent dissolving device is higher in market popularization value.