solution to detect radar wave reflection that usgooe to detect human presence through wall
Short answer: no.

Long answer: of course there's detectors for specific types of radar. These mainly have military usage. 

But: you can do radar with any waveform. I've been building OFDM radar systems with IEEE802.11-compatible waveforms (as in: Wifi) myself.

Also, if you want to do radar, you don't even have to be the one emitting the signal – bistatic radars use separate senders and transmitters, and passive radars use someone else's signal (popular: broadband signals such as digital TV, but I've seen this be demonstrated with GPS, and other signals, too).

So, there can be no such device, because you can physically only sense what someone else emits, not what someone else receives, and even moreso, you can't see what they're doing with the received signal, so you can't tell a pure Wifi device from a wifi device that also does radar.