A financing model for bank loan financing, equity financing, and portfolio financing under the manufacturer's capital constraints is constructed, and the manufacturer's capital level and consumers are discussed in green preference on pricing, green input level, market demand for products, and selection strategies of financing methods. Finally, it is verified by numerical analysis. Consumers' green preference is positively correlated with retail prices, wholesale prices and the level of green investment efforts, market demand for products, and equity transfer ratios acceptable to both parties in equity financing; when the manufacturer's capital constraints are not financing, the manufacturer's initial capital level is positively correlated with manufacturer's wholesale price, and retailer's retail price are negatively correlated, but it is positively correlated with the level of green investment efforts; the greater the bank loan interest rate, the larger the manufacturer's acceptable share transfer ratio.