The invention discloses a sliding water nozzle device for slag blocking of a converter. The sliding water nozzle device is characterized in that F-shaped fixed door shaft seats are arranged on the two sides of a fixed frame; the distance from the central holes of the F-shaped fixed door shaft seats to the groove bottom of an inner sliding brick groove is 172 to 177 mm; T-shaped spring chambers are arranged on the two sides of an opening-closing frame, so that the widths of spring pressing plates and slide rails are taken in consideration; the upper and lower sides of the spring chambers are thickened and are provided with movable door shaft holes; the fixed frame is fixed to a debugging frame; the door opening angle is 110 degrees or above; the interference phenomenon is prevented; during pressurization operation, surface pressure bolts penetrate through the spring pressing plates, springs and the opening-closing frame to be screwed on the fixed frame; and surface pressure is uniformly transmitted between an inner slide brick and an outer sliding brick through the slide rails. According to the sliding water nozzle device for slag blocking of the converter provided by the invention, the door opening angle is large, the spring pressure fluctuation is small, the surface pressure transmission is uniform and constant, the off-line operation is convenient, the maintenance is simple, the cost is low, and the safety performance is good, and the device is an ideal substitute product of conventional converter slag blocking devices of which the weight is 180 tons or below.