The invention discloses a power input assembly for a high-power low-voltage SVG and APF, which comprises an A-phase branch, a B-phase branch, a C-phase branch and a panel which are arranged in parallel, and each of the A-phase branch, the B-phase branch and the C-phase branch comprises an external wire shield, a fuse, a main relay, a current-limiting relay, a current-limiting resistor and a reactor, the external wire protective cover, the fuse, the main relay and the reactor are sequentially connected along the straight line direction, the current-limiting relay and the current-limiting resistor are positioned on the outer side of the main relay, and the external wire protective covers of the A-phase branch, the B-phase branch and the C-phase branch are fixed on the panel. The invention has the characteristics of simple structure, low temperature rise, high reliability, small volume, low cost and the like.