  Superflares, as strong explosions on stars, have been well studied with the
progress of space time-domain astronomy. In this work, we present the study of
superflares on solar-type stars using Transiting Exoplanet Survey Satellite
({\em{TESS}}) data. 13 sectors of observations during the first year of the
{\em TESS} mission have covered the southern hemisphere of the sky, containing
25,734 solar-type stars. We verified 1,216 superflares on 400 solar-type stars
through automatic search and visual inspection with 2-minute cadence data. Our
result suggests a higher superflare frequency distribution than the result from
{\em Kepler}. The reason may be that the majority of {\em TESS} solar-type
stars in our dataset are rapidly rotating stars. The power-law index $\gamma$
of the superflare frequency distribution ($dN/dE\propto E^{-\gamma}$) is
constrained to be $\gamma = 2.16\pm 0.10$, which is a little larger than that
of solar flares but consistent with the results from {\em Kepler}. Because only
7 superflares of Sun-like stars are detected, we may not give a robust
superflare occurrence frequency. And four stars are accompanied by unconfirmed
hot planet candidates. Therefore, superflares are possibly caused by stellar
magnetic activities instead of planet-star interactions. We also find an
extraordinary star TIC43472154, which exhibits about 200 superflares per year.
In addition, the correlation between energy and duration of superflares
($T_{\text {duration }} \propto E^{\beta}$) is analyzed. We derive the
power-law index to be $\beta=0.42\pm0.01$, which is a little larger than
$\beta=1/3$ from the prediction according to magnetic reconnection theory.
