This dataset results from a study that introduced a novel gel adhesive composed of chemically unmodified high-amylose starch (G70, with 68% amylose content) with a minimal proportion of urea-formaldehyde (UF) (UF/starch = 1:10, w/w). This G70/UF gel demonstrates remarkable adhesive capabilities for wooden boards under both dry conditions (with a shear stress of 4.13 ± 0.12 MPa) and wet conditions (with a shear strength of 0.93 ± 0.07 MPa after 2 hours of water soaking). The dataset contains Origin (Unicode) Project files used to generate the plots shown in the associated paper, "High-amylose starch-based gel as green adhesive for plywood: Adhesive property, water-resistance, and flame-retardancy". It also contains scanning electron microscopy (SEM) images for NCS/UF, G70/UF, and G50/UF gel samples, which are not shown in the paper; and raw X-ray photoelectron spectroscopy (XPS) data for NCS/UF and G70/UF gel samples, visualised in Figure S1 in the paper's supplementary material.