On Friday, 26,100 refugees from Ukraine arrived in Poland, according to the agency.
Meanwhile, 25,400 people left Poland for Ukraine on Friday, the Border Guard noted.
Poland in March passed a bill that offers wide-ranging support to Ukrainians escaping the Russian invasion of their country, which began on February 24.
The measure grants them residence rights and ensures access to education, healthcare and social benefits.
Nine in 10 Poles are in favour of accepting refugees from war-torn Ukraine, according to a survey.
Saturday is day 115 of the Russian invasion of Ukraine.