The invention discloses a drier temperature control method and a drier system. A drier is communicated with a hot-blast stove through a pipeline, the drier is provided with an air draft mechanism, a first temperature sensor is arranged in the pipeline and outputs a sensing signal to a controller, the controller outputs a control signal to the air draft mechanism, a second temperature sensor is arranged in the drier, and the second temperature sensor outputs a sensing signal to the controller. According to the method, the temperature sensors are additionally arranged near the heat exchange position, variable-frequency speed control is conducted on an air draft motor through a frequency converter, and closed-loop control of temperature in the drying process is achieved finally; control precision is improved, and constant-temperature control can be conducted on different types of grain to achieve the optimal drying efficiency.