The invention discloses a breakpoint cutting device for paper, and relates to the technical field of processing of office supplies. The office breakpoint cutting device for the writing paper comprisesa box body; an inner cavity of the box body is fixedly provided with a partition plate; the box body is divided into a cutting chamber and a waste chamber through the partition plate; a first liftingrod and a second lifting rod are arranged in a top plate of the box body; the bottom ends of the first lifting rod and the second lifting rod penetrate through the top plate of the box body and extend into the interior of the cutting chamber; the top ends of the first lifting rod and the second lifting rod are fixedly connected through a connecting plate; teeth are arranged on the left side of the first lifting rod; a first spring is fixedly arranged at the position, between the bottom end of the connecting plate and the top end of the box body, of the second lifting rod; and a rotating motoris fixedly arranged at the top end of the box body. According to the breakpoint cutting device, a half-toothed gear rotates to drive the first lifting rod and the second lifting rod to lift so as todrive a cutter to do reciprocating motion, so that the writing paper can be rapidly cut, and therefore the processing efficiency of the writing paper can be improved.