The invention discloses a high-power adjustable plasma ignition test bed system for a pulverized coal boiler. The plasma ignition test bed system comprises a coal pulverizing system, a pulverized coal feeding system, an air supply system, a combustion system and a smoke treatment system. The coal pulverizing system comprises a coal mill, a pulverized coal temporary storage bin and a lifter. Pulverized coal needed by the test is milled to be different in fineness through the coal mill, the fineness of the pulverized coal is adjusted by changing the parameters of a frequency conversion analysis motor arranged in the coal mill, the milled pulverized coal is conveyed into the pulverized coal temporary storage bin, and the pulverized coal in the pulverized coal temporary storage bin is lifted into the pulverized coal feeding system through the lifter. The plasma ignition test bed system increases the advantages of the direct-current plasma ignition technology in ignition temperature, technical performance and application range and has the advantages of being simple, small in maintenance amount and high in coal type adaptability, and the service life of electrodes is long.