I have tried to uninstall it (for me it is malicious software because I do not know when and how have I obtained it) through settings and reboot my phone but it keeps coming back and blocks my phone, constantly offering some options with no other possibility as confirming access or installation.
Uni Launcher is indeed malware, and will install other software silently where it is able to do so.
If your phone happens to be a HOMTOM HT7 (you didn't specify a model), you'll want to install the latest update from the manufacturer (2.0.3). This will remove the malware by replacing the launcher, and also fix some other issues.
Update: Supposedly a 2.0.7 update has been released now as well, but some people have indicated issues with this particular version.