The invention provides an aluminum profile production online continuous monitoring system. The system comprises a top plate, bottom plates, supporting rods, side plates, U-shaped plates, limiting rods, a supporting plate, a push rod motor, a square plate, a first motor, a linkage shaft, a transmission roller, a sleeve roller, a first rotating shaft and a second rotating shaft, wherein the bottom plates are symmetrically arranged below the top plate, and the side plates are fixedly connected with sides opposite to the bottom plates; supporting rods are symmetrically and fixedly connected to the bottom of the bottom plate, and a supporting plate is arranged on one side of the top plate. The detection mechanism can monitor and detect surface flatness and whether surface defects exist or not during aluminum profile production, so unqualified aluminum profiles can be detected in time during production, a distance between the detection rods can be adjusted by rotating the threaded rod, the multiple detection rods are matched with one another, aluminum profiles in different shapes can be conveniently monitored and detected, so the aluminum profiles can be continuously monitored and detected during production, unqualified aluminum profiles can be identified, and production efficiency is improved.