The invention relates to the technical field of optical fiber preform manufacturing equipment, and discloses an automatic temperature rise control system for a PCVD holding furnace. A PLC is added, the PLC adopts a specific algorithm to calculate the actual set temperature value SPX of a temperature control instrument according to a temperature C fed back by a temperature sensor in real time, theactual set temperature value SPX is sent to the temperature control instrument, and the temperature control instrument then performs fuzzy control calculation according to the SPX adjusted in real time. In comparison with the prior art, the intelligent control of the PLC is used to perform temperature rise setting according to the specific algorithm, and in combination of the PID fuzzy control technology of the temperature control instrument, the temperature rise efficiency of the holding furnace and the service life of heating components such as a holding furnace control cabinet and a siliconcarbide rod are improved, and high-precision constant temperature control on the holding furnace can be realized.