Technology is ubiquitous in the educational field nowadays. Augmented Reality is one of the emerging technologies with more potential in educational contexts in the mid-term. The purpose of this study is to evaluate if the use of Augmented Reality in early childhood education improves the learning of English as a foreign language, increases pupils' motivation and helps children at this age to establish more positive socio-affective relationships. A quasi-experimental study with an experimental and a control group was carried out with 52 and 50 early childhood education pupils, respectively. The results show a significant improvement in motivation, learning and socio-affective relationships in the experimental group, who completed instruction where AR was employed as a teaching tool, in comparison with the control group.