The invention discloses a monitoring device and method for protecting user privacy based on an iPhone operating system (iOS). The monitoring device is provided with an application collection unit, an application analysis detection unit and an information management unit. The monitoring device can be used for conducting monitoring and early warning on whether application program software (APP) leaks user privacy (comprising contact information, mobile phone numbers, positions of mobile phones, short messages, user accounts, passwords, call records, photos, favorites, history, email addresses, contents of emails and the like), reminding a user of the potential risk of the software, and storing and analyzing the monitored result, and then conducts software security level evaluation on the application program according to a software security level research algorithm. The mobile phone security monitoring device is simple in structure, ingenious in design, simple in operating steps, easy to learn and master and safe in use, and has application and popularization prospects.