This study reports a laser diode array (LDA) double-pass double-end pumped Yb∶YAG slab laser. Pump distribution models of double- and single-pass double-end pump structures are created based on the absorption characteristics of the pump in the medium. The advantages of a double-pass double-end pump are theoretically analyzed. Under the pump frequency of 400 Hz, pulse width of 1 ms, and single pump energy of 12 J, the polarization multiplexing technology is used to realize the double-pass and double-end pump slab laser. The output laser energy is about 6.13 J with an optical-optical conversion of 50%. In comparison with a single-pass double-end pump mode with the same doping concentration and absorption efficiency of the pump light, the double-pass double-end structure demonstrates the advantages of higher laser energy, higher optical conversion efficiency, and greater stability. The theoretical analysis and experimental results prove that the utilization of the double-pass double-end pump can further improve laser output energy and efficiency.