A temperature detection circuit and method are provided. The temperature detection circuit samples a first delay time for an input signal at a target temperature to be detected, stores a first addresses generated as the sampled result, samples a second delay time for the input address at a present operating temperature, compares a second addresses generated as the sampled result with the first addresses, and generates a detection signal if the target temperature to be detected is the same as the present operating temperature. The temperature detection method is performed by the temperature detection circuit.