In this paper, a new topological acoustic interlayer is proposed, which is formed by combining multi-order resonators in the form of the triangular lattice in the normal direction of the acoustic interlayer. Through the strong resonance of the resonator, the distribution of modes in the acoustic interlayer is directly induced to form a combination of modes with different topological states to support the subwavelength multi-channel lossless directional acoustic transmission in barrier-free space. Since there are no scatterers, not only can the required frequency band be directly achieved through the resonance frequency of the resonator alone, but also the background medium space in which the acoustic wave transmitting is a uniform medium, so the transmission is secret and the structure is ventilated. More importantly, there is more space in the normal direction of the barrier-free interlayer for design sub-wavelength multi-channel transmission. Furthermore, the random obstacles in interlayer do not affect the transmission under the pseudo spin modes. Finally, experimental verification is carried out. This research paves the way for the engineering application of multi-band acoustic antennas, covert communication, ventilated devices and other multi-functional devices, and will bring new enlightenment to the fields of elastic wave, light wave and electromagnetic wave.