Not illegal.

Two-color ball is a kind of social welfare lottery. Personal income tax is temporarily exempted for individuals who purchase social welfare lottery tickets with prizes and donations, and the income from one-time winning is less than 10000 yuan. If the income exceeds 10000 yuan, they should be taxed in full according to the provisions of the tax law.

The winning money is accidental and exceeds 10000 yuan. Personal income tax is calculated and paid in full at the rate of 20%. Two-color ball is a game of China Welfare Lottery.

China welfare lottery "two-color ball" is a kind of "lottery" welfare lottery which is uniformly organized and distributed by China Welfare Lottery Distribution Management Center and sold in the whole country. "Two-color ball" lottery tickets are purchased voluntarily, and all buyers are deemed to agree and abide by these rules.

Legal basis:

"Notice of State Taxation Administration of The People's Republic of China on the Taxation of the Income from the Issuance of Social Welfare Lottery" temporarily exempts individuals from collecting personal income tax if the income from one-time winning of social welfare lottery tickets does not exceed 10000 yuan; if the income from one-time winning exceeds 10000 yuan, it shall be taxed in full according to the provisions of the tax law.