The invention discloses an automatic demand response operation mode based on flexible load control. The automatic demand response operation mode based on flexible load control comprises steps of providing demand response services in different time scales like peak clipping, virtual peak adjustment and standby service through performing flexible control on a flexible load according to different load management goals. The flexible load has a remote controllable and adjustable capability and can fast respond to a demand response signal. The flexible control comprises operation mode adjustment, operation parameter adjustment and operation mode adjustment. The operation mode adjustment reduces a quantity of redundant devices in operation. Operation parameter adjustment is to change part of operation parameters of a device and appropriately reduce input power of the device. The operation mode adjustment is to transfer or reduce load output through reasonably adjusting operation time and a working state of the device. The automatic demand response operation mode based on flexible load control improves device operation efficiency and service life and reduces pressure on control of a rigidload in orderly power utility.