Sealing glass is used to connect and seal same or different kinds of materials. The development of sealing glass with higher expansion coefficient (CTE) is needed due to the recent request for high-quality sealing between multiple metals. This review introduces domestic and international research status of sealing glass with CTE higher than 90×10-7 ℃-1, and discusses the development trend of sealing glass with high CTE. Lead-free crystalline sealing glasses can match more metals by their possibility of achieving higher CTE. The performance of lead-free sealing glass is not inferior to lead-contained sealing glass and able to replace lead-contained sealing glass in the future. Lead-free crystalline sealing glasses has greater development advantages.