Is it difficult to buy a train ticket from Suzhou to Shanghai during Spring Festival travel rush?

A short trip should be fine. I suggest you go to the sales outlets in the city. There are both Leqiao and Guanqian Street. Although there is a charge of 5 yuan, there will be fewer people, especially at night, which will save you from queuing at the railway station. If you must go to Pingsi Road Railway Station, try to go in the afternoon to avoid the morning ticket rush. However, try to buy tickets in advance. First, get the tickets early and feel at ease. Second, if you buy it earlier, the time to Shanghai will be better, because tickets in prime time are still tight. If you can't get a ticket, you can go by bus. In short, it's convenient to go to Shanghai, so don't be too nervous. Ha ha.

I hope you have a wonderful trip!