The invention relates to a simulation system for simulating harmonic characteristics of a charging station running in different situations. The system comprises a plurality of charger models connected in parallel, each charger model is respectively connected with a charger initial capacity control module and a charger input stop control module, and the charger initial capacity control module and the charger input stop control module are respectively connected with a user-defined charging station parameter configuration module; and each charger is powered with 380V AC (Alternating Current) voltage. According to the invention, an original simplified charger model is improved so that input characteristics of the original simplified charger model is matched with actual output characteristics of the charger, and the original simplified charger model can change factors influencing the harmonic characteristics of the charging station so that an actual charging situation of the charging station can be simulated more reliably and the harmonic characteristics of the charging station and the influence on the grid are researched, thereby guiding the construction of a large-scale charging station and the design of a harmonic suppression device.