‘Betahealth,’ a new high β-glucan covered barley cultivar, was developed from a cross between ‘Betaone’ and ‘Dahyang’ at the National Institute of Crop and Food Science, Rural Development Administration, Korea, in 2023. ‘Betahealth’ was bred to enhance the cultivation stability of the high β-glucan cultivar ‘Betaone’ while maintaining its functional properties. Regional yield trials were conducted at five locations between 2021 and 2023. ‘Betahealth’ is a six-rowed winter barley cultivar with a vernalization type IV growth habit. In the adapted regions, the average heading and maturity dates were April 22 and May 28, respectively. The culm length was 79 cm and the 1,000-grain weight was 32.3 g. ‘Betahealth’ exhibited resistance to Barley yellow mosaic virus and strong lodging tolerance. However, it was susceptible to powdery mildew and cold. Grain quality demonstrated that ‘Betahealth’ had a waxy endosperm with a low amylose content (3.2%) and a high β-glucan content (14.2%), which was higher than those of ‘Hyeyang’ (5.2%) and ‘Betaone’ (12.4%). Additionally, it revealed superior cooking quality with higher water absorption and expansion rates than those of the other cultivars. The estimated glycemic index values of 100% barley and a 20% barley-rice mixture were 41.90 and 42.92, respectively, which were the lowest among the tested cultivars. The average grain yield in the adapted region was 511 kg/10a, which was not significantly different from that of ‘Hyeyang’. Thus, ‘Betahealth’ is expected to be a useful functional barley cultivar due to its high β-glucan content, favorable cooking quality, and stable agronomic performance (Registration No. 10754).