Diaphragm cutting device

A membrane cutting device comprises a feeding frame, a cutting table, a cutter and a dust removal assembly. The feeding frame and the cutting table are sequentially arranged in the feeding direction of coiled materials. The cutter is movably arranged on the cutting table, the dust removal assembly comprises a shell, a roller brush, a pulse type air nozzle and an exhaust pipe, the shell is arrangedbetween the feeding frame and the cutting table, a dust removal cavity and a feeding hole are formed in the shell, the feeding hole is communicated with the dust removal cavity, the roller brush is rotationally arranged in the dust removal cavity, and the pulse type air nozzle is installed in the dust removal cavity; when a coiled material is conveyed, the coiled material sequentially passes through the feeding frame and the cutting table, the coiled material is tensioned by the feeding frame and guided into the cutting table to be cut, and the conveying precision of the coiled material is improved; when the roller b