The invention discloses a gear metering pump. A pump body is provided with a gear cavity, a first lubricating groove and a second lubricating groove. A first driving bearing, a second driving bearing, a first driven bearing and a second driven bearing are fixed on the two side walls of the gear cavity, the non-driving end of a driving shaft is fixed in the first driving bearing and the second driving bearing, and both the first driving bearing and the non-driving end of the driving shaft are positioned at the opening part of the first lubricating groove. One end of a driven shaft is fixed on the first driven bearing, and both the first driven bearing and one end of the driven shaft are positioned at the opening part of the second lubricating groove. Both a driven gear and a driving gear are positioned in the gear cavity, and the driven gear is meshed with the driving gear. Through the mode, part of a fluid medium entering clearances between the driving shaft and the driving bearings and clearances between the driven shaft and the driven bearings can be collected through the lubricating grooves, so that the phenomenon that the fluid medium returns the gear cavity, affects the purity of other fluids and affects the properties of the fluids is avoided.