The invention discloses an electric spring energy assimilation system. The invention improves the current electric spring structure to adapt to the grid structure of the same end with source and load.An alternating current side of a first single-phase inverter is connected in series with a wide voltage load. A direct current side of the first single-phase inverter is connected with a direct current bus through a bidirectional isolated power electronic transformer. New energy power generation equipment is assembled on the direct current bus, so that an isolated back-to-back structure of the same end with source and load is formed. Under a condition that the power generation power of a distributed new energy power supply is not affected, the alternating current bus voltage is regulated by the wide voltage load, the safe and reliable operation is achieved. An isolated power electronic transformer is arranged between the first single-phase inverter and the grid-connected converter to be isolated. The circuit can be protected, the control program is simplified, and the control of the direct current voltage of the first single-phase inverter is realized. Technical problem that in a weaknetwork environment at the same end with source and load, new energy assimilation is insufficient , which is very prone to occur a high voltage table problem and is hardly solved economically and effectively can be solved.