Pyrolysis is the key of resource utilization of phosphogypsum. However, in the absence of reducing agents and catalysts, the disadvantages of phosphogypsum utilization include high energy consumption, high cost and low decomposition rate. Therefore, it is an important challenge to find the reducing agents and catalysts which can reduce the decomposition temperature of phosphogypsum and improve the decomposition rate. In this paper, the research status of the pyrolysis process of phosphogypsum was reviewed in the presence of reducing agents and catalysts. Traditional fuel-based reducing agents, e.g. CO and coke, have more advantages in practical application, which can effectively reduce the initial decomposition temperature of phosphogypsum and improve the decomposition efficiency. The addition of non-traditional reducing agents (sulfur, H2S) and catalysts can not only reduce the cost of phosphogypsum pyrolysis, but also reduce the emission of greenhouse gas CO2 during the pyrolysis of phosphogypsum. However, this method is still in the experimental research. Searching for suitable reducing agents and catalysts with higher decomposition efficiency and lower energy consumption and cost in the pyrolysis process is crucial for achieving green, low-carbon and efficient resource utilization of phosphogypsum.