The utility model provides a wind-curtailment power assessment device based on the sampling machine power of a wind power plant, and the device comprises an EMS system data interface (1) and an SDADA system data interface (2), which are respectively connected with the input end of a data quality control module (5). The output end of the data quality control module (5) and the output end of a scheduling instruction parsing module (4) are respectively connected with the input end of a database module (6). The input end of the scheduling instruction parsing module (4) is connected with a wind and power integrated management system data interface (3). The input end of the database module (6) is connected with the input end of a multiple regression module (7). The output end of the database module (6) and the output end of the multiple regression module (7) are respectively connected with the input end of a wind-curtailment power calculation module (8). The device provided by the utility model improves the accuracy of wind-curtailment power assessment, and provides the basis for the precision evaluation of wind power forecast precision and the economy evaluation of wind power operation containing operation control.