We thoroughly explore the cosmic gravitational focusingof cosmic neutrino fluid (CνF) by dark matter (DM) halousing both general relativity for a pointsource of gravitational potential and Boltzmannequations for continuous overdensities. Derived inthe general way for both relativistic andnon-relativistic neutrinos, our resultsshow that the effect has fourth powerdependence on the neutrino mass and temperature.With nonlinear mass dependence which is differentfrom the cosmic microwave background (CMB) andlarge scale structure (LSS) observations,the cosmic gravitational focusing can provide anindependent cosmological way of measuring the neutrinomass and ordering. We take DESI as an example toillustrate that the projected sensitivity as well as itssynergy with existing terrestrial neutrino oscillationexperiments and other cosmological observations cansignificantly improve the neutrino mass measurement.