The utility model relates to a speed chain ammeter detection assembly line using a dual-layer sliding plate. A work zone includes 19 detection stations. To be specific, at the no.1 station, ammeter is online and 12-V power is exerted to detect whether the ammeter is electrified. At the no.2 station, a vacancy state is maintained. At the no.3 station, an ammeter bar code and a tool plate ID are read. At the no.4 station, a vacancy state is maintained. At the no.5 station, a vacancy state is maintained. The stations from no.6 to no.13 form one group and a stopper and an optoelectronic switch are arranged at the tail end of the no.13 station; when the ammeter runs to the no. 13 station and the optical path is blocked, a power-up system carries out ammeter power-up operation at the tool plate and displays valley balancing ammeter data circularly simultaneously; and meanwhile, a visual shooting system corresponding to each station is used for carrying out shooting on the ammeter at the station. The no.14 station and the no.15 station are used as the standby ones and are used for carrying out emergency processing and manual intervention on special situations. The no.16 station and the no.18 stations are used vacancy ones. The no.19 station is used as an off-line one and is used for detecting off-line encasement of the completed ammeters. The provided assembly line has advantages of rapid power up, advanced visual identification, and high detection efficiency and the like.