The invention provides a connector system for a ceiling reverse support and a construction method of the connector system. The ceiling reverse support comprises full-thread transverse full-length arranged rods, full-thread suspension rods transversely and evenly arranged on the full-thread transverse full-length arranged rods at intervals, and full-thread diagonal rods, wherein the full-thread diagonal rods are arranged on the two sides of the full-thread suspension rods, and the two ends of the full-thread diagonal rods are fixed to the full-thread suspension rods and the full-thread transverse full-length arranged rods. The connector system is characterized in that one-way connectors arranged at the connection joints of the full-thread transverse full-length arranged rods and the full-thread diagonal rods, crossed connectors arranged at the crossed connection joints of the full-thread suspension rods and the full-thread transverse full-length arranged rods, bi-directional connectorsarranged on the full-thread suspension rods and used for being connected with the full-thread diagonal rods on the two sides, and fastening screws used for fastening the connectors and all the parts of the ceiling reverse support are included. The ceiling reverse support is rapider, easier and more convenient to mount, dismantle and alter, modification and adjustment are convenient, the original rust-proof property of main suspension rods is prevented from being damaged, and the rust-proof treatment process is omitted.