The invention discloses a square pipe concrete column workshop assembly clamping fixture. The square pipe concrete column workshop assembly clamping fixture comprises a fixed base, horizontal support plates, longitudinal positioning rods, a first positioning reference stopper, a second positioning reference stopper and clamping pieces; the fixed base is H-shaped steel; one end is welded with the second positioning reference stopper; the multiple horizontal support plates are welded on the fixed base; the fixed base is connected with the first positioning reference stopper through welding multiple clamping pieces on one side edge; multiple sets of double-row grooves are formed in the first positioning reference stopper; and the double-row grooves are fixedly connected with the longitudinal positioning rods through bolts. The square pipe concrete column workshop assembly clamping fixture realizes the assembly positioning and precise size control of square pipe concrete lattice columns in the machining process, improves the production efficiency of machining assembly, guarantees the machining and the machining quality, improves the repeated utilization rate, and reduces the cost.