Potassium (K+), a physiological regulator that influences cell excitability and the stimulus-secretion coupling through complex mechanisms, is necessary for normal insulin release from the pancreatic β-cell. Here, we look at the several ways that potassium channels and ion gradients regulate insulin production when blood glucose levels fluctuate. Modifications of voltage-gated K+ channels (Kv), inward-rectifier K+ channels (Kir), and ATP-sensitive K+ channels (K_ATP) control changes in the membrane potential that result in Ca2+ entry and β-cell depolarization, two essential components of the insulin exocytosis pathway. When insulin granules are released, excessive glucose stimulation results in increased ATP production, which causes membrane depolarization, K_ATP channel blockage, and voltage-dependent Ca2+ channel activation. Conversely, type 2 diabetes is brought on by altered K+ channel function, which reduces α-cell secretion. The article summarizes current data from electrophysiological, genetically modified animal, and pharmacological studies to give an overview of potassium's regulatory function in β-cell activity. The significance of K+ channels as a medication target in diabetes is further highlighted by this data.