The invention discloses a super-high strength and high hardness TiB2 particle reinforced Al-Zn-Mg-Cu composite material and a preparation method thereof, and belongs to the field of composite materials. Al-Zn-Mg-Cu alloy serves as a matrix, TiB2 with the mass fraction being 3%-10% and with the average size smaller than 1 micron serves as reinforcing particles, and the Al-Zn-Mg-Cu alloy matrix comprises, by mass, 8%-10% of Zn, 1.0%-2.0% of Mg, 1.0%-1.5% of Cu, 0.05%-0.20% of Zr, and the balance Al. Al-TiB2 intermediate alloy is prepared through a melt self-propagating direct synthetic method, proportioning and smelting are carried out according to the design ingredients of the composite material, the Al-TiB2 intermediate alloy serves as a matrix, an Al ingot, a Zn ingot, a Mg ingot, Al-Cu intermediate alloy and Al-Zr intermediate alloy are added, standing is carried out after stirring, and casting is carried out. The TiB2 particles are uniform in distribution and small in dimension, and both the strength and hardness are remarkably improved compared with those of the matrix alloy.