Spatial gene expression heterogeneity plays an essential role in a range of biological, physiological and pathological processes but it remains a challenge to conduct high spatial resolution, genome wide, unbiased biomolecular profiling over a large tissue area. Herein, we present a fundamentally new approach called microfluidic Deterministic Barcoding in Tissue for spatial omics sequencing (DBiTseq). It permits simultaneous barcoding of mRNAs, proteins, or even other omics on a fixed tissue slide to construct high spatial resolution multiomics atlas by deep sequencing. Applying it to mouse embryo tissues revealed major tissue types in early organogenesis, distinguished brain microvascular networks, discovered new developmental patterning in forebrain, and demonstrated the ability to detect a single cell layer of melanocytes lining an optical vesicle. DBiTseq can be readily adopted by biologists with no experience in microfluidics or advanced imaging, and could be quickly disseminated for broader impacts in a variety of fields including developmental biology, cancer biology, neuroscience, and clinical pathology.