Bobby Portis Jr. says he loves Milwaukee, but he's not feeling it back from the city ..

. 'cause a couple burglars broke into his home during a game -- and, he's got it all on video. The Milwaukee Bucks star took to his X account Sunday .

.. sharing a video saying he loves the Cream City -- noting it's the first time in his 10-year journeyman career he's really felt at home somewhere.

Portis Jr. highlights his charitable work in the clip ..

. saying he's helped out with food drives, spoken to young people in the community and more -- saying Milwaukee's his home, so why wouldn't he want to make it a better place. However, Portis says someone made his own home less safe Saturday night .

.. sharing video of two people -- flashlights on -- standing outside his frontdoor, apparently trying to break in.

Watch the clip ...

two people -- outfitted in snow jackets with ski masks on -- seemingly working on the lock to Portis' home. Portis asks people with any information to come forward ..

. offering a reward for any tip that helps him get some or all of his stuff back. BPJ played pretty well against the Cleveland Cavaliers Saturday night .

.. scoring 10 points and grabbing eight rebounds in a heartbreaking 114-113 loss.

We've reached out to Portis for more info ...

so far, no word back..