The Triticeae tribe, which includes essential cereal crops such as wheat and barley, plays a critical role in global food security. In the era of functional genomics, microRNAs (miRNAs) have emerged as key regulators of gene expression, influencing diverse biological processes including growth, development, and stress responses. However, miRNA data for Triticeae species remain fragmented across independent sources, limiting systematic comparative and functional studies. To address this challenge, we developed TriticeaemiRDB, an integrated platform dedicated to Triticeae miRNAomics. This database currently encompasses 12 Triticeae species, and systematically curates 1,541 high-quality miRNA-seq samples from 84 public BioProjects, providing comprehensively annotated miRNAs and their predicted target genes based on reference genomes. The platform supports user-friendly data browsing, retrieval, and visualization (including expression heatmaps), and integrates advanced tools such as BLAST alignment, miRNA precursor secondary structure prediction, miRNA target prediction, differential expression analysis, and GO enrichment. As a foundational resource, TriticeaemiRDB aims to accelerate miRNA discovery, functional characterization, and evolutionary studies, thereby supporting genetic improvement of Triticeae crops.