The invention relates to a Beidou satellite navigation system performance monitoring device. The Beidou satellite navigation system performance monitoring device comprises a Beidou satellite text reception unit, a Beidou text monitoring analysis unit, a Beidou satellite autonomous positioning unit, a Beidou satellite time service unit, a positioning result detection unit, a synchronization precision detection unit, a user interaction unit and a power supply unit. The invention further provides a monitoring method for the Beidou satellite navigation system performance monitoring device. Abnormal text and data are timely identified and indicated in a satellite text monitoring process, corresponding measures can be conveniently adopted, reduction of damage caused by the abnormal text data is facilitated; accuracy of each type of text data can be identified, which satellite has abnormal parameters can be acquired through back stepping according to the positioning and time service result, abnormality reasons can be rapidly positioned on the condition of positioning and time service, and solution efficiency is improved. Beidou positioning and time service are carried out in real time, mastering performance of Beidou systems can be facilitated, reasonable positioning and time service algorithms can be selected, and development of high-performance Beidou application products is facilitated.