The invention provides a hard austenitic stainless steel for a conveyor and a manufacturing method and application thereof. The chemical compositions of the austenitic stainless steel comprises, by mass, 0.07%-0.10% of C, 1.0% or the less of Si, 2.0% or the less of Mn, 16.5%-17.5% of Cr, 6.5%-7.0% of Ni, 0.02%-0.04% of N, 0.4%-0.6% of V, 0.040% or the less of P, 0.01% or the less of S and the balance Fe and inevitable impurities. On the basis of the chemical compositions of common 301 stainless steel, a small quantity of V is added, the proportion of alloy components is optimized, and especially it is guaranteed that Nieq is 18.9-21, so that the fluctuation range of performance after same quenching-tempering and cold rolling process is reduced; and the total reduction ratio of quenching-tempering and cold rolling is reduced, the reduction ratio of single pass of cold rolling is reduced, and the condition is provided for improving of plate cut.