The jacking weigher consists of a pedestal, elevating mechanisms, a jacking rack, a weighing detector, a sliding support, elastic elements and other parts. It has also at least one sliding guide unit set between the pedestal and the jacking rack, at least two locating guide units set between the jacking rack and the sliding support, at least one elevation locating and detecting unit set between the pedestal and the jacking rack, and two limiting units set separately on two sides of the sliding support. It may be used widely for jacking and weighing, especially in garbage collecting vehicle.