Is there a hotel with a beach and sea at the push of a door in Qingdao?

Yes, in Qingdao Development Zone. It's called Hanbilou, but the price per night is at least 4,000 RMB.

Qingdao Hanbi Building is the first cultural and creative resort hotel of Taiwan Province Xianglin Group in Chinese mainland, and the first super five-star hotel in Chinese mainland and Taipei, China. The hotel is located in Huangdao District, Qingdao, backed by Phoenix Mountain and surrounded by the sea on three sides. Designed by kerry hill, a world-famous architect, the hotel abandons complicated and dazzling decorations in a modern and simple style, so that guests can fully feel the leisure and relaxation integrated with the blue sea and blue sky. The hotel will set up special wedding church, international conference center, top banquet hall, boutique, outdoor soup spring, spa, French, Japanese and Italian multinational gourmet restaurants and other high-end holiday facilities to build a top-class tourist resort hotel for Qingdao.

This is also the first seven-star hotel in Shandong.

I hope my answer can help you.