LaTeX.org

You can use tikz package with protect , as suggested in https://tex.stackexchange.com/questions/115352/tikzpicture-within-figure-caption

\documentclass{article}
\usepackage{tikz}
\begin{document}

\begin{figure}[h]
-- This is a figure --
\caption{Figure within caption {\protect\tikz \protect\draw ...