The utility model provides a data collecting device, include: first standard interface group, a standard connection group, extension module group, main collector and data output module, each standard interface in the first standard interface group for receive the measured data of line concentration case or sensor output, and transmit the extension module for corresponding with received measured data, each extension module in the extension module group for give received data transmission main collector, main collector for pass through the received data the output of data output module. Use the utility model discloses can the character recognition with collect the measured data in every each sensor of unit, and portable and installation / dismantlement, therefore improved the availability factor, practiced thrift a large amount of costs of labor, the device reusability is strong, economic nature is good, can be used for different nuclear power unit's data reading and collection, can also realize that processing of real -time autoanalysis and result appear.