The invention provides a blanking device in an insulin needle heat sealing assembler, belongs to the technical field of machinery and solves the problem that the conventional blanking devices are not suitable for the blanking of insulin needle packaging paper. The insulin needle heat sealing assembler comprises a frame, wherein a rotating shaft and a turnplate fixedly connected with the rotating shaft are arranged in the center of the frame; the turnplate is fixedly connected with a template which can rotate along with the turnplate; and the template is provided with a plurality of paper blocking troughs used for mounting the packaging paper. The blanking device comprises an upper die holder and a lower die holder which are arranged above the paper blocking troughs, wherein a paper conveying port through which the packaging paper passes is formed between the upper die holder and the lower die holder; the frame is provided with a paper conveying mechanism which can allow the packaging paper to pass through the paper conveying port and also a plurality of dies and a power device (1) driving the dies to move up and down; the upper die holder is provided with a through hole through which the dies pass; and the lower die holder is provided with a blanking opening for allowing finished paper formed by blanking to fall into the paper blocking troughs. The blanking device has convenient blanking and the blanked finished paper is conveyed precisely.