The wireless image transmission system has a wide range of applications in high-definition video surveillance, remote medical image transmission, virtual reality, and augmented reality. With the support of 5G networks, the wireless image transmission system can achieve longer distance transmission, faster data transfer, and more stable connections, enhancing user experience and system performance. This article designs a wireless image transmission system based on OFDM+QAM and Turbo coding, as well as MMSE channel estimation. According to the basic principles and common algorithms of OFDM modulation/demodulation and Turbo coding, algorithm simulations were conducted to obtain corresponding performance curves, comparing the impact of different QAM modulation methods on the clarity of received images with SNR, summarizing the SNR requirements needed to meet the error rate for high-definition image transmission, and providing guidance for the design of 5G wireless image transmission systems.