This paper designed a solar automatic tracking controller based on single chip. The tracking controller took the single chip STC89C52 as the microcontroller to send pulses to a step motor driver. In sunny days, an ordinary silicon photocell was used for rough track-ing and a PSD sensor was used for accurate tracking. When the weather condition was not good, data recorded in sunny days was used to carry out tracking. Actually measured data shows that automatic tracking controller can effectively raise the system to receive solar radiation energy, reaching preset goal.%设计了一种基于单片机的太阳能自动跟踪器，该跟踪器由单片机STC89C52作为微控制器发送脉冲给步进电机驱动器，在天晴时采用普通的硅光电池作粗略跟踪，位置传感器PSD作精确跟踪，天气情况不好时则采用天晴时追踪记录的数据进行跟踪。实际测量数据表明，该自动跟踪器可有效提高系统接收的太阳辐射量，达到了预期目的。
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