The invention discloses a series connection battery pack two-way charging and discharging equalization circuit based on inductor energy storage. At least three battery single bodies are connected in series, at most seven battery single bodies are connected in series, a series connection battery pack is divided into an upper portion and a lower portion, the connection point of the upper portion and the lower portion is N, the upper portion includes battery single bodies from the positive end of the series connection battery pack to the connection point N, the lower portion includes the battery single bodies from the connection point N to the negative end of the series connection battery pack, m is an odd number, n is an even number larger than or equal to 2, m=n-1 or m=n+1, and m <=7. An equalization sub circuit connected with odd batteries is an odd equalization circuit, and an equalization sub circuit connected with even batteries is an even equalization circuit. By means of the circuit, overcharging and overdischarging are avoided in the charging and discharging process, the series connection battery pack unequalization is avoided, the battery pack available capacity is improved, the maintenance and replacement period of the series connection battery pack is reduced, the service life of the battery pack is prolonged, and the cost of hybrid electric vehicles, electric automobiles and energy storage power stations is reduced.