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Being capable of sensing human through obstacles, bio-radar is promising in many applications like healthcare, public securities, emergency rescue and so on. In these applications, the presence of human and the human count are among the most important issues that are concerned by people. At present plenty of studies deal with the former issue but there's no study dealing with the latter one. To this end, a framework of determining the count of human targets using ultra-wideband (UWB) bio-radar was presented in this paper. It was developed based on multiple antennas and correlation processing of sensed respiration among the data channels. In the experiment, the UWB bio-radar could distinguish among the cases of no target, single target, two targets and three targets present behind a brick wall and determine the target count with no priori information. On this basis, multi-target estimation and localization can be further realized. [ABSTRACT FROM PUBLISHER]