The invention provides a low-voltage line voltage reactive power compensation control device which comprises a shell which is fixedly connected to a mounting bracket and a low voltage line split-phase automatic voltage adjustment device arranged in the shell. The low voltage line split-phase automatic voltage adjustment device an A phase voltage adjustment compensation module installed between an A phase line and a zero line, a B phase voltage adjustment compensation module installed between a B phase line and the zero line, and a C phase voltage adjustment compensation module installed between a C phase line and the zero line. The A phase voltage adjustment compensation module, the B phase voltage adjustment compensation module and the C phase voltage adjustment compensation module are controlled by a controller. The controller comprises a GPRS communication module and receives the control of a remote controller through the GPRS communication module. The problems of large current and the difficult matching with an automatic control switch can be solved effectively, and a load balance can be achieved.