The invention provides a crushing device for multicrystal rock candy. The crushing device comprises a crushing box body with an open at the top and an extrusion mechanism, wherein the extrusion mechanism is arranged above the crushing box body, the extrusion mechanism comprises an extrusion cylinder, a stretchable rod of the extrusion cylinder is connected with a pressing plate, and a plurality ofsquare array distributed pressing blocks are arranged at the bottom of the pressing plate; a first partition plate and a second partition plate are arranged inside the crushing box body from top to bottom, the first partition plate and the second partition plate sequentially divide the interior of the crushing box body from top to bottom into a moving chamber, a transition chamber and a collection chamber, a plurality of fixing columns are connected between the first partition plate and the second partition plate, the fixing columns are located on the periphery of the transition chamber, damping springs are arranged on the fixing columns, a knife rest mounting hole is formed in the middle of the first partition plate, a knife rest is arranged in the knife rest mounting hole, a control hole is formed in the middle of the second partition plate, an insertion plate is arranged in the control hole, the insertion plate controls opening and closing of the control hole, and a collection boxwith an open at the top is arranged in the collection chamber. According to the crushing device, the working efficiency is high, and the size and shape of the cut rock candy are more uniform.