The invention discloses a wind-electricity variable pitch UPS system based on super-capacitors and the control method thereof. The UPS system comprises a super-capacitor group(10), a charge and discharge circuit(20), a control circuit(30) and a contactor(50). The super-capacitor group(10) is connected with the charge and discharge circuit(20) which is in connection with a DC generatrix(40)throughthe contactor(50); the control circuit(30), connected with the charge and discharge circuit(20), controls the operation of the charge and discharge circuit(20), and the whole system is connected or not with the DC generatrix(40) through the control of the contactor(50). The UPS system makes use of the control circuit(30) to control energy to flow in two ways between the super-capacitor group(10) and the DC generatrix(40), thus realizing continuous power supply. The UPS system is based on a simple principle and is flexible in structure; meanwhile, the high efficient charge and discharge control strategy can improve energy utilization ratio of the super-capacitor group and reduce installation content and cost of the system, thus greatly improving the technical performance and economic performance of the system.