According to a method for automatically unfolding a computer monitor when starting a notebook, the opening speed of the computer monitor is determined, according to a predetermined starting time needed for a computer starting program (for example, the average time needed for the operating system initialization after activating the notebook) and a predetermined opening angle of the computer monitor, after the notebook is started. Meanwhile, a shaft coupled to the computer monitor is controlled through an on-off device according to the opening speed of the computer monitor, to unfold the computer monitor to a using position. This greatly facilitates the usage of a notebook upon its starting and activating. Further, its design is more convenient.