The invention discloses a composite type machine room floor construction method. The composite type machine room floor construction method comprises the following steps of (a) ground cleaning; (b) snap line positioning; (c) floor bracket fixing; (d) insulation board laying; (e) leveling; (f) anti-electrostatic floor laying; (g) repeating installation; (h) corner treatment of insulation boards; (i)corner treatment of anti-electrostatic floors; and (j) gap filling. The composite type machine room floor construction method avoids unnecessary workload, has a good heat insulation effect, and reduces high requirements on the ground flatness; and the floors are laid neatly and attractively and can be easily disassembled, and the maintenance is more convenient.