The invention discloses a water cooling furnace mouth and a converter. The water cooling furnace mouth comprises a furnace mouth body (1), a cooling water tube (6), a water inlet tube (3), and a water outlet tube (4), wherein the cooling water tube is arranged in the interior of the furnace mouth body in an embedded manner, two ends of the cooling water tube are respectively connected with the water inlet tube and the water outlet tube which are stretched out of the furnace mouth body, and the water cooling furnace mouth also comprises reinforced steel bars (5) embedded into the furnace mouth body; the converter comprises a converter body (2), and the water cooling furnace mouth which is connected with the converter body through a connection piece (7). The strength of the water cooling furnace mouth is improved by additional arrangement of reinforced steel bars in the water cooling furnace mouth, so that the water cooling furnace mouth is not easy to crack and deform, therefore, the service life of the water cooling furnace mouth is prolonged. The invention also provides the converter by applying the water cooling furnace mouth into the converter, wherein the replacement period of the water cooling furnace mouth is longer.