How are the salaries of teachers in private primary and secondary schools in Shanghai?

Pretty good.

As a first-tier city, Shanghai has high incomes, many school benefits, and five insurances. The overall salary and benefits are quite good.

Shanghai, referred to as Shanghai, is the birthplace of the Communist Party of China. It is a provincial-level administrative region and municipality in the Republic of China, a national historical and cultural city, and an international economic, financial, trade, Shipping, science and technology innovation center.