The invention provides a method for generating solid modulating plasma photonic crystals with four refractive indexes. The method comprises the following steps that two water electrodes are arranged in a vacuum reaction chamber, and the water electrodes are electrically connected with a plasma generation power source; a solid frame is arranged between the two water electrodes, a plurality of through holes arranged in a matrix mode are formed in the internal area of the solid frame, and every two adjacent through holes are separated through a solid ridge; mixed gas of air and argon is introduced into the vacuum reaction chamber to serve as discharge gas, and the gas pressure of the discharge gas is adjusted to range from 0.1 atm to 1 atm; a switch is switched on, and the solid modulating plasma photonic crystals with the four refractive indexes and with plasma, the gas and the solid ridges periodically arranged can be generated in discharge gaps. The solid modulating plasma photonic crystals with the four refractive indexes are generated for the first time, spreading of certain frequency light can be stopped, the function of a frequency selective photoswitch is achieved, and the method has wide application prospects in the field of industry.