The utility model relates to the technical field of distribution network testing, in particular to a low-voltage distribution network source load characteristic simulation system, which comprises a distribution transformer, a low-voltage outgoing line of the distribution transformer is a power supply side, a three-phase four-wire system low-voltage distribution network line model is adopted by a load side of the distribution transformer, and the line model comprises an A-phase line, a B-phase line, a C-phase line and an N zero line. A three-phase low-voltage reactive power compensation device,a three-phase motor load, an A-phase user load, a B-phase user load and a distributed power supply are sequentially hung on the load side of the distribution transformer; the three-phase motor load is provided with terminals electrically connected with the A-phase line, the B-phase line and the C-phase line respectively, the A-phase user load is electrically connected with the A-phase line, and the B-phase user load is electrically connected with the B-phase line. According to the utility model, a corresponding simulation system can be arranged according to the low-voltage circuit distribution of an actual low-voltage transformer area, thereby facilitating the supply of scientific reference basis for the load segmentation, line selection, transformer site selection and capacity configuration of a low-voltage power distribution network, and achieving the higher engineering practicality.