There have been a lot analysis on carbon nanotubes (CNTs) modified cement-based supplies. Nevertheless, few research utilized multi-walled CNTs (MWCNTs) to organize the ultra-high energy concrete (UHSC). This examine goals to find a brand new UHSC strengthened by MWCNTs and reveal the enhancement mechanism of MWCNTs. On this examine, the mechanical properties of UHSC with totally different contents of MWCNTs (each dispersed and undispersed) had been examined. The ingredient distribution and microstructure of UHSC had been noticed by energy-dispersive spectrum (EDS) and scanning electron microscopy (SEM). As well as, the pore constructions of UHSC had been exhibited by X-ray CT pictures. The end result reveals that the compressive energy and flexural energy of UHSC reached the utmost worth with the addition of 0.1 wt% dispersed MWCNTs. The dispersed aqueous answer of 0.1 wt% MWCNTs may be uniformly distributed within the UHSC matrix, and MWCNTs can fill the preliminary defects and bridge the microcracks contained in the UHSC. Furthermore, with the addition of 0.1 wt% dispersed MWCNTs, the variety of pores decreased by 59.98%, and the porosity of UHSC decreased by 14.41%. The expectation of this examine is to supply a reference for the higher preparation of UHSC.