A temperature recorder mainly includes a micro control unit (MCU), a temperature sensing circuit, a memory with RF transmission function, and at least one antenna unit. The MCU electrically connects to the temperature sensing circuit and the memory, and the antenna unit electrically connects to the memory. The temperature sensing circuit senses external temperature variations surrounding the temperature recorder, and the sensed temperature variations are progressed by the MCU and then stored into the memory in accordance with scheduled parameters. The temperature recorder can be connected externally through wired serial transmitting interface or wireless radio frequency (RF) transmitting interface when internal temperature data needs to be retrieved, or a new parameter needs to be written into the memory. Thus, the memory in the temperature recorder can be retrieved and written via both wired connection and wireless connection, the usage of the temperature recorder is more flexible.