The standard classes (book
, report
, article
, memoir
, etc) print a caption in a table as (for the first table)
Table 1: Caption text
which is what you wanted. What have you done to prevent that?
You can use the tocloft
package for changing the entry style in the LoT. Here's a MWE that provides what you are after.
% captiontocprob.tex SE 545537
\documentclass{report}
\usepackage{tocloft}
\renewcommand{\cfttabpresnum}{Table } % put this before the number
\setlength{\cfttabnumwidth}{4em} % more space needed for Table number
\renewcommand{\cfttabaftersnum}{:} % put this after the table number
\begin{document}
\listoftables
\begin{table}
\centering
A TABLE
\caption{Tables's caption}
\end{table}
\end{document}
Read the tocloft
documentation for detailed information (texdoc tocloft
).
It would really have helpful if you had given us an MWE so we didn't have to guess what you had done; I'm doing my best to be nice but I'm a GOM.