My residence and passport have expired. I want to go back to China in the summer vacation. Can I go back to China and get a new Spanish visa? What are the consequences?

Go to the police station to apply for a home visit permit. But if you don't put it in the immigration office to apply for an extension of stay. You can't get home visit permission. Generally, the police station will give you a home visit card for three months. Anyway, you can't apply for an extension until you stay in Spain for half a year. Your passport has expired. I must apply for a passport at the consulate. Anyway, let's put it in the consulate now. Apply first. Then go to the immigration office to apply for an extension to July, which is sure to be in time. The consulate is usually half a month. Then you can take the materials to the immigration office, go to the police station to get a permit to visit relatives, and then you can go back to China.