A facile pressure controllable self-assembly apparatus was designed, and perfect three-dimensional face-centered cubic(FCC) photonic crystals(PCs) were fabricated by using polystyrene colloidal micorspheres with diameter of 260 nm. The effects of pressures on photonic band gap depth and photonic band edge slope were analyzed and the optimal pressure condition(P=5999.5 Pa) for PCs growth was confirmed. Three photonic crystals were fabricated once and their transmittance spectra were measured. The transmittance spectra measured at different positions of the same PC and different PCs are similar. Fabry-Pérot oscillations appear at both sides of the main transmittance valley. PCs fabricated by this experimental apparatus are uniform, similar and highly ordered in the long-range crystal orientation and large areas. The experimental apparatus can be used to fabricate PCs in small-batch.