The invention relates to an automatic metering detection time service system. A top-level time server, a middle-level time server and a bottom-level time server are comprised, and the top-level time server, the middle-level time server and the bottom-level time server are connected sequentially from up to down level by level, the top-level time server comprises a provincial measurement center first-level time server, a second-level time server and a GPS, an input end of the second-level time server is connected with the provincial measurement center first-level time server and the GPS, an output end of the second-level time server is connected with the middle-level time server, the middle-level time server is connected in parallel with multiple three-level time servers, each three-level time server is connected in parallel with multiple pieces of bottom-level detection equipment, and all the bottom-level detection equipment are bottom-level time servers. The system is advantaged in that a multi-level time service system scheme is proposed, the acquired GPS time information is added, time verification of the top-level time server is carried out, and the time of detected equipment is guaranteed to be reliable.