Water makes up over 98% of all molecules in the body and it is necessary for several biological processes. Water quality has been shown to influence animal's performance. In recent years, interest in water treatment technology has increased, particularly in poultry. Magnetised water is one of water treatment that has attracted poultry researchers and breeders, due to its low cost compared to chemical and physical water treatments. Water magnetisation changes water properties, making it become more fluid, alkaline and energised. Unfortunately, the information detailed in the literature provides opposite views on the effect of magnetised water on poultry's performance. However, magnetised water, particularly with high gauss (more than 1000 gauss/month) could improve health (immunity), growth (approximately +4 % in weight) for broilers and enhance some egg production traits for hens, such as eggshell thickness (approximately +9 %). This review provides information detailed in the existing literature on the influence of magnetised water on poultry health and production.