The present disclosure relates to a method for controlling entry to a full load mode of an engine in a hybrid electric vehicle. The method includes: determining an anti-jerk torque margin value by using an anti-jerk torque value monitored in real-time; determining a filter gain value selected from a filter gain command table; and determining whether to activate the full load mode of the engine based on a value obtained by subtracting the determined anti-jerk torque margin value from an assisting torque value of a motor of the vehicle that assists an output of the engine.