The invention discloses a mobile terminal-based "one-key security" platform and its implementation method, including a one-key security module, a security greeting module, a photo processing module, a background delivery module, an outline inlay module, an expression setting module, a learning and entertainment module and Personal information module; realize eight functions: geographic positioning, safe theme, image processing, background distribution, contour mosaic, expression setting, learning and entertainment, and personal information. In the present invention, when the user clicks on the one-key security module, the user's security information can be sent to the pre-associated short message platform with one key. If the sender has also added the receiver's WeChat ID, as long as the user selects the WeChat ID number, the user's safety information will also be sent to the receiver's WeChat platform with one click. The user can also judge whether to choose to execute the selection module according to needs. The present invention all has very important promoting effect and great practical significance to modern social civilization and the happiness of family.