The invention relates to a chromium fog purification plant and a chromium fog purification system. The chromium fog purification plant comprises an air channel, an air inlet, an air outlet, primary filter structures, a secondary filter structure, a water retaining structure and a plurality of spraying openings. The spraying openings are formed in the upper sides of the primary filter structures and the secondary filter structure. The primary filter structures comprise corrugated plate groups, the corrugated plate groups comprise a plurality of corrugated plates which are arrayed in the left-right directions, every two adjacent corrugated plates are separated from each other to form a bent gas flow channel, and grooves which are perforated in the up-down directions are formed in the corrugated plates and are opened towards the direction of the air inlet. The chromium fog purification system comprises the chromium fog purification plant. The chromium fog purification plant and the chromium fog purification system have the advantages that chromium fog waste gas can be effectively treated by the chromium fog purification plant and the chromium fog purification system, and exhausted purified waste gas conforms to national emission standards; stable operation can be guaranteed for a long term without deterioration of purification effects, the maintenance frequencies and costs can be lowered, and the chromium fog purification plant and the chromium fog purification system are favorable for guaranteeing continuous production operation.