Universities usually have departments. The School of Economics of Shenzhen University is a department of Shenzhen University, similar to the School of Mathematics, the School of Communication and the Teachers College. If you find it difficult to understand, you can change "college" to "department", that is, "Shenzhen University Economics Department". They are essentially the same. The School of Economics of Shenzhen University is a department of Shenzhen University, not a few private colleges under the banner of Shenzhen University.

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This is the content of the homepage of Shenzhen University, which says the department settings. You can go and have a look.