Urea pump for vehicle-mounted SCR system

The utility model relates to the technical field of SCR (Selective Catalytic Reduction) systems, and provides a urea pump for a vehicle-mounted SCR system, which comprises a shell and a gear pump, and the gear pump is arranged in the shell, is provided with an input end and an output end and is used for pumping urea solution; the filter is arranged at the input end of the gear pump, is provided with a liquid inlet and a liquid outlet, and is configured to filter a urea solution to be introduced into the gear pump; the urea pipeline comprises a liquid inlet pipeline, a liquid spraying pipeline and an overflow pipeline, the liquid inlet pipeline is arranged at a liquid inlet of the filter, the liquid spraying pipeline and the overflow pipeline are connected to the output end of the gear pump in parallel, and the liquid spraying pipeline is communicated with the overflow pipeline through a process flow channel; a process runner opening is improved into a runner top opening structure from a runner end opening, th