In　order　to　design　vertical　formwork,　an　accurate　model　to　predict　the　lateral　pressure　of　fresh　concrete　is　needed　in　construction　practice.　However,　there　have　been　few　studies　on　the　lateral　pressure　of　concrete　walls　subjected　to　ultra-deep　vibration　and　great　differences　exist　on　the　determination　of　form　pressures　and　vibration　depth　in　the　current　national　codes.　This　paper　reports　a　test　of　four　concrete　wall　specimens　that　was　carried　out　to　study　the　effect　of　ultra-deep　vibration　on　the　lateral　pressure　of　fresh　concrete　and　the　distribution　of　lateral　pressure　at　various　heights　of　concrete　walls.　Based　on　the　vibrating　liquefaction　and　hydrostatic　pressure　balance　theory,　a　calculation　model　of　the　lateral　pressure　of　concrete　under　ultra-deep　vibration　is　put　forward,　together　with　a　derived　formula　for　simplified　calculation.　The　predictions　of　the　model　are　compared　with　the　experimental　results,　and　it　is　shown　that　the　proposed　model　is　able　to　explain　the　experiment　observations　and　predict　with　reasonable　accuracy　the　lateral　pressure　in　fresh　concrete　walls　subjected　to　ultra-deep　vibration.