The invention relates to ultra-early strength high-performance concrete and a preparation method thereof. The ultra-early strength high-performance concrete comprises the following components in partsby weight: 700 to 770 parts of
cement, 410 to 480 parts of composite mineral admixture, 170 to 190 parts of water, 1180 parts of composite aggregates, 47.2 to 48.0 parts of polycarboxylate
superplasticizer, 0.20 to 0.25 parts of defoaming agent and 157 parts of steel fibers, wherein the composite mineral admixture consists of 118 to 177 parts of precipitated fine beads, 59 parts of
metakaolin and212.4 to 236 parts of
silica fume; and the composite aggregates consist of 514 to 543 parts of China ISO standard sand (medium sand), 255 to 266 parts of 5 to 10 mm
basalt crushed stone, and 382 to400 parts of 10 to 16 mm
basalt crushed stone. The ultra-early strength high-performance concrete is high in early strength, the
compressive strength in 3 days is 120 to 140 MPa, the
compressive strength in 7 days is greater than 150 MPa; and the ultra-early strength high-performance concrete has good working performance, has no segregation, bleeding and bottom grabbing, and has self-compacting effect.