documentclass{article}
usepackage{standalone}
standaloneconfig{mode=buildnew}
usepackage{tikz,pgfplots}
pgfplotsset{compat=newest}
begin{document}
    this is a Document.
begin{figure}[!hbt]
    centering
    includestandalone{Standalone}
    caption{The caption text}label{fig:abc}
end{figure}
end{document}

documentclass[convert=false]{standalone}
usepackage{tikz}
usepackage{pgfplots}
begin{document}
begin{tikzpicture}
begin{axis}
addplot[blue, mark=x] coordinates {(0,0)
    (1,2)(2,3)
    (3,4)(4,6)
    (5,11)(6,20)
    (7,15)(8,12)
    (9,8)(10,7)
    (11,3)(12,0)};
label{axis1}
end{axis}
%
end{tikzpicture}
end{document}