The invention provides a grouting head, which includes a tapered cylinder, a slurry pipe, and a backstop device, and the slurry pipe is located in the tapered cylinder. One end of the slurry pipe is provided with a grouting port, and the other end is close to an end, relatively small in diameter, of the tapered cylinder. The end, away from the grouting port, of the slurry pipe is provided with thebackstop device. The backstop device includes a steel ball, a spring, and a limit rod connected in sequence. A method of using the grouting head includes the following steps: drilling multiple grouting holes at the edge of a seepage fissure to be grouted; pulling out the seepage fissure to form a V-shaped groove and filling the V-shaped groove with rapid hardening cement; embedding the grouting head into the slurry holes; compressing the steel ball by slurry during the grouting process, and flowing the slurry into the seepage fissure or empty area through the slurry pipe; evacuating the grouting equipment after the grouting is completed with the grouting head being not recovered, and cutting off the portion, higher than the seepage fissure, of the grouting head . The grouting head can inject the slurry relatively quickly and is beneficial to plugging a large flow rate and pressurized seepage points. At the same time, the grouting head has a clever design, is convenient to install andhas low manufacturing cost.