Building-block-type combined low-voltage capacitor

The embodiment of the application discloses a building-block-type combined low-voltage capacitor, and aims to solve problems that a conventional low-voltage capacitor cannot normally work if a controller breaks down. The building-block-type combined low-voltage capacitor comprises a housing, a switching controller and a communication module, wherein the switching controller and the communication module are disposed inside the housing and are connected with each other. The capacitor itself provided by the embodiment comprises the switching capacitor, so that if a plurality of the capacitors are adopted for reactive compensation, the plurality of the capacitors can be combined like building blocks. Moreover, a controller needs not be additionally employed, and through communication among the capacitors, switching information can be exchanged and all the capacitors can be controlled in a switched manner.