The invention discloses a trend recognition method of a total regulation power curve in automatic power generation control. The trend recognition method comprises the following steps: step 1, forecasting the total regulation power curve P (t) in the automatic power generation control and dividing a recognition time interval of the total regulation power curve P (t); step 2, judging a total regulation amount trend curve of the total regulation power curve P (t) in the automatic power generation control according to a size relation among a maximum power value, a minimum power value and a current power value in the recognition time interval of the total regulation power curve P (t). Through the trend recognition method of the total regulation power curve in the automatic power generation control disclosed by the invention, the total regulation amount trend curve which can be tracked by an automatic power generation control set is outputted, the occurrence of generator set reverse regulation is effectively reduced, the actual regulation direction of the generator set is consistent with that of a target curve, and the total regulation efficiency is improved through coordinating the increase and decrease of the powers of all power generators.