The invention discloses a weighing and packaging machine, and relates to the technical field of metering and packaging of leaf plants. The weighing and packaging machine is composed of a rack, a packaging component, a weighing barrel, a weighing component, an operation component and a weighing lifting device; the weighing lifting device is composed of a weighing lifting bottom support (2), a weighing lifting pushing support, a weighing lifting power source and a weighing lifting support (7). The weighing and packaging machine has the beneficial effects of being high in weighing accuracy, long in service life, suitable for plant leaf weighing and packaging and the like, and can be used for weighing and packaging plant leaves such as kelp and tobacco leaves and plant stems such as straw and wheat straw.