Tubular particleboard is made of wood shavings through high-temperature extrusion. It is a particleboard with round thru-holes aligned lengthwise in the board. This paper discussed the development of multidimensional-interface extrusion technology. Process parameters were determined for the production of five different particleboard thicknesses of 24 mm, 28 mm, 35 mm, 40 mm, and 60 mm. The authors also tested the physical and lengthwise mechanical properties of the tubular particleboards. The manufactured tubular particleboards had the following properties, with respect to the above thicknesses: MOR of 4.9 to 2.2 MPa; MOE of 380 to 250 MPa; IB of 0.54 to 0.37 MPa; TS of 1.7 to 0.8%; and LDC of 9.1 to 5.2%. All met the values specified in the standards LY/T 1856 (2009) and GB/T 34717 (2017). MOR was ≥1 and ≥1.7; IB was ≥0.1 and ≥0.17; TS was ≤5; LDC was ≤15. It was concluded that as the thickness of the board increased, the mechanical properties decreased, but the physical properties increased. When compared to traditional extruded tubular particleboards, the multidimensional-interface extruded tubular particleboards had excellent physical and lengthwise mechanical properties. In addition, the lengthwise mechanical properties were similar to flat-pressed tubular particleboard, and ultra-thick particleboard can be produced.