hmm, that solutoin works great:)
class ProvinceForm(ModelForm):
    def __init__(self, *args, **kwargs):
        super(ProvinceForm, self).__init__(*args, **kwargs)
        user_provinces = 
UserProvince.objects.select_related().filter(user__exact=self.instance.id).values_list('province')
        self.fields['name'].queryset = 
Province.objects.exclude(id__in=user_provinces).only('id', 'name')

    name = forms.ModelChoiceField(queryset=None, empty_label=None)

    class Meta:
        model = Province
        fields = ('name',)

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