MK Consult
Yes, your husband can open a company in Poland, but for this, he needs to meet several conditions. In particular, he must have a legitimate basis for staying in Poland, such as a residence card (residence permit) or PESEL (universal identification number). Without this, he will not be able to register individual entrepreneurship (IP) or a company【4:1†source】【4:6†source】.
If he has a residence card or receives a PESEL, he can register a business through CEIDG (Central Register and Information on Economic Activity). This can be done online or at a local office【4:6†source】【4:17†source】.
What kind of business is he planning to open?