The invention belongs to the field of power equipment control technology, and relates to a measuring system and a measuring method for measuring the actuation time of a high-voltage breaker of a non-load transformer loop. The system comprises a high-voltage-side transformer, a low-voltage-side transformer and a single-chip microcomputer module. The control instruction output end of the single-chip microcomputer module is connected with a breaker drive circuit. The signal input end of the single-chip microcomputer module is connected with a disconnection detection circuit and a connection detection circuit. The disconnection detection circuit is connected with the high-voltage-side transformer via a high-voltage signal acquisition terminal. The connection detection circuit is connected with the high-voltage-side transformer and the low-voltage-side transformer respectively via the high-voltage signal acquisition terminal and a low-voltage signal acquisition terminal. According to the technical scheme of the invention, the connection time duration and the disconnection time duration of the high-voltage breaker in the non-load transformer loop in the high-voltage state can be accurately measured.