Abstract: A dissolver capable of increasing the dissolution rate, includes a tank body, a feeding pipe, a connecting moveable rod, and a moveable disc, the feeding pipe is communicated with the tank body, and being configured to flow raw materials into the tank body. The connection movable plate is slidably mounted inside the feeding pipe, the raw materials flows into the tank body or is prevented flowing when the connection movable plate slides from an inner front side to an inner rear side of the feeding pipe. The connecting moveable rod, provided with an end inserted into the feeding pipe to connect to the connection moveable plate, and the other end exposed outside the feeding pipe. The moveable disc is connected to the other end of the connecting moveable rod, and driven to rotate and enable the connection movable plate slide inside of the feeding pipe.