Phase change microcapsules of capric acid coated with urea-formaldehyde resin were prepared by in-situ polymerization using urea, formaldehyde and capric acid as raw materials. Orthogonal experiments were designed with core-wall mass ratio, emulsifier dosage, emulsifying speed and curing agent content. The morphology, chemical structure and thermal storage properties of capric acid microcapsules were characterized by ESEM, FTIR and DSC. The anti-seepage properties of capric acid microcapsules were tested by leak rate test. The results showed that the compound emulsifier m(OP-10): m(Span-80)=4:1 was beneficial to improve the particle characteristics of capric acid microcapsules. capric acid microcapsules P (core wall mass ratio 3:2, emulsifier dosage accounted for 5% of core material quality, emulsifying speed 1400 r/min, curing agent dosage accounted for 12% of urine quality) were well dispersed and uniform in micro-morphology, latent heat of phase transformation was 123.91 J/g, the leakage rate and coating rate were 6.95% and 69.70%, respectively. Compared with capric acid microcapsules S (core wall mass ratio 3:2, emulsifier dosage accounted for 5% of core material quality, emulsifying speed 1400 r/min, curing agent dosage accounted for 12% of urine quality), the leakage rate of capric acid microcapsule P decreased by 133.8%, while the coating rate increased by 132.3%. Capric acid microcapsule P has good thermal properties.