Provided is a tongue-and-groove type multi-layer fracturing pipe column with equal drift diameters. The problems that an existing multi-layer fracturing pipe column is obvious in throttling effect and large in friction are mainly solved. The tongue-and-groove type multi-layer fracturing pipe column is characterized in that a safety connector (1), a hydraulic anchor (2), packers (3), more than two pressure guide sand blasting packers (4) with sleeve bridges, pressure guide sand blasting packers (5) without sleeve bridges and a screwed plug (6) are connected on the pipe column in series from top to bottom, umbrella groove type sliding sleeves (7) are arranged in the pressure guide sand blasting packers (4) with the sleeve bridges, and falcon wing type switches are arranged in the umbrella groove type sliding sleeves (7). The tongue-and-groove type multi-layer fracturing pipe column with the equal drift diameters has the advantages of reducing throttle losses and lowering the friction.