The invention discloses a method and a system for remotely and rapidly realizing software updating of a power utilization information acquisition terminal, which comprise the following steps: establishing a remote communication link between a server and terminal equipment by utilizing remote network communication so as to obtain control information of an operation software package on the terminalequipment; Determining an updating software package matched with the running software package according to the control information of the running software package; Unpacking the updated software package to obtain control information; Comparing the control information of the update software package with the control information of the running software package to obtain difference information, and extracting a program file to be upgraded from the update software package according to the difference information to generate a patch file; And the patch file is issued to the terminal device through the remote communication link, so that the terminal device completes software package updating according to the upgrading processing logic. According to the method, the network transmission data volumeis obviously reduced, and the upgrading efficiency is improved; And meanwhile, the problem that the version of the software package cannot roll back is effectively solved.