The invention discloses a rainwater recovery and utilization device for a transformer substation, and relates to the technical field of power supply equipment. The rainwater recovery and utilization device comprises a cistern, and the cistern is connected with a toilet of a main control building of the transformer substation through a rainwater control mechanism. According to the rainwater recovery and utilization device for the transformer substation, impurity filtration and removal of impurities are conducted through utilizing the improved cistern, the original elasticity of an upper layer hard sponge layer can be restored, so that the service life of the hard sponge layer is longer, and mechanical switch flushing of the toilet and hand washing are achieved by means of a rainwater control mechanism. By adoption of the rainwater recovery and utilization device, waste is turned into wealth and harm is turned into benefits with the help of rainwater resource of the original transformersubstation, and the device conforms to the general trend of current environmental protection and energy conservation for the country. The rainwater recovery and utilization device is also relatively low in cost and suitable for use in most transformer substations.