The utility model discloses a discharge valve and a reactor. The discharge valve comprises a valve body (1), an end cover (2), a sealing cover (4) and a valve rod (5), wherein a first end of the valve body is provided with a feed hole (6), a second end of the valve body is provided with the end cover, an inner end of the valve rod is positioned in the valve body and is connected with the sealing cover, and an outer end of the valve rod penetrates through the end cover to extend outwards; the sealing cover is arranged towards the feed hole and is provided with a convex part (41) which protrudes towards the feed hole; under pushing of the valve rod, the feed hole is blocked by the sealing cover, and the convex part is inserted into the feed hole and is used for pushing the material in the feed hole outwards. Before the feed hole is blocked through match of the sealing cover and the valve seat, a material in the feed hole is pushed outwards by the convex part, so the problem of blockage of the sealing surface is avoided by the discharge valve, and the sealing property of the discharge valve is enhanced.