The invention belongs to the theoretical method of electricity settlement in the electricity market, and in particular to an electric energy settlement method under the pre-listed monthly balance deviation mechanism. The method comprises the following steps of 1, determining a calculation condition; 2) calculating the composition electric energy of the deviation electric energy of the market members; 3) calculating the energy imbalance electricity price and the punishment electricity price for not implementing the electricity quantity adjustment; and 4) calculating the electric energy settlement feed of the market members. The method of the invention clarifies the composition of the deviation electricity of the market members through the mechanism analysis, and the settlement method is more fair and reasonable. The punishment on the market members due to their own reasons is executed, which makes the contract in the electricity market more binding and is conducive to the operation of the electricity market standardization. The method is more transparent and efficient, and is suitable for the future electric power market transaction mode which has a shorter transaction cycle in China's electric power market.