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The PLATZ (plant AT protein and zinc-binding protein) transcription factor family is involved in the regulation of plant growth and development and plant stress response. In this study, 24 <i>SlPLATZs</i> were identified from the cultivated tomato genome and classified into four groups based on the similarity of conserved patterns among members of the same subfamily. Fragment duplication was an important way to expand the <i>SlPLATZ</i> gene family in tomatoes, and the sequential order of tomato <i>PLATZ</i> genes in the evolution of monocotyledonous and dicotyledonous plants and the roles they played were hypothesized. Expression profiles based on quantitative real-time reverse transcription PCR showed that <i>SlPLATZ</i> was involved in the growth of different tissues in tomatoes. <i>SlPLATZ21</i> acts mainly in the leaves. <i>SlPLATZ9</i>, <i>SlPLATZ21</i>, and <i>SlPLATZ23</i> were primarily involved in the red ripening, expanding, and mature green periods of fruit, respectively. In addition, <i>SlPLATZ1</i> was found to play an important role in salt stress. This study will lay the foundation for the analysis of the biological functions of <i>SlPLATZ</i> genes and will also provide a theoretical basis for the selection and breeding of new tomato varieties and germplasm innovation.