\usepackage{caption}\begin{document}
\captionsetup{labelformat=default,labelsep=space} 
\renewcommand\thefigure{\arabic{section}-\arabic{figure}}\section{第一章标题}
\setcounter{figure}{0}  %将图序号清零\begin{figure}[H]
\centering
\includegraphics[scale=1]{picture.jpg}  
\caption{图标题}
\label{1-1}
\end{figure}\clearpage
\section{第二章标题}
\setcounter{figure}{0}\end{document}