Shein is expected to price around 280 million shares at about HK$48.56 apiece, potentially raising HK$13.6 billion ($1.7 billion).
The proposed valuation is nearly 74% below Shein's earlier $100 billion price tag, as slowing growth, tariffs and competition from Temu weigh on the business.
The Hong Kong listing follows abandoned US and UK IPO attempts, with existing Shein backers playing a major role among the company's cornerstone investors.