A blood pressure detection method applied to a blood pressure detection apparatus, the blood pressure detection apparatus comprising a processor that executes the blood pressure detection method, and the blood pressure detection method comprising: acquiring blood pressure calibration information, the blood pressure calibration information being information obtained by processing a first pressure acting on a user and a first photo plethysmography, PPG, signal when the first pressure acts on the user; acquiring a second photo plethysmography signal when no pressure acts on the user, and processing the second photo plethysmography signal to obtain the user's initial blood pressure; calibrating the initial blood pressure according to the blood pressure calibration information, and using the blood pressure obtained by calibration as the blood pressure of the user; wherein the first pressure changes with time, the determining the blood pressure calibration information according to the first pressure and the first photo plethysmography signal, comprises: sorting (S1 151) the first photo plethysmography signal corresponding to the first pressure according to a magnitude of the first pressure to form an envelope signal of the first photo plethysmography signal; determining the first blood pressure of the user according to the envelope signal; using the first blood pressure as the blood pressure calibration information; wherein calibrating the initial blood pressure according to the blood pressure calibration information, and using the blood pressure obtained by calibration as the blood pressure of the user, comprises: using the blood pressure calibration information as a direct current component of the blood pressure of the user; using the initial blood pressure as an alternating current component of the blood pressure of the user; calibrating the alternating current component of the blood pressure of the user according to the direct current component of the blood pressure of the user, and using the blood pressure obtained by calibration as the blood pressure of the user. acquiring blood pressure calibration information, the blood pressure calibration information being information obtained by processing a first pressure acting on a user and a first photo plethysmography, PPG, signal when the first pressure acts on the user; acquiring a second photo plethysmography signal when no pressure acts on the user, and processing the second photo plethysmography signal to obtain the user's initial blood pressure; calibrating the initial blood pressure according to the blood pressure calibration information, and using the blood pressure obtained by calibration as the blood pressure of the user; wherein the first pressure changes with time, the determining the blood pressure calibration information according to the first pressure and the first photo plethysmography signal, comprises: sorting (S1 151) the first photo plethysmography signal corresponding to the first pressure according to a magnitude of the first pressure to form an envelope signal of the first photo plethysmography signal; determining the first blood pressure of the user according to the envelope signal; using the first blood pressure as the blood pressure calibration information; wherein calibrating the initial blood pressure according to the blood pressure calibration information, and using the blood pressure obtained by calibration as the blood pressure of the user, comprises: using the blood pressure calibration information as a direct current component of the blood pressure of the user; using the initial blood pressure as an alternating current component of the blood pressure of the user; calibrating the alternating current component of the blood pressure of the user according to the direct current component of the blood pressure of the user, and using the blood pressure obtained by calibration as the blood pressure of the user. sorting (S1 151) the first photo plethysmography signal corresponding to the first pressure according to a magnitude of the first pressure to form an envelope signal of the first photo plethysmography signal; determining the first blood pressure of the user according to the envelope signal; using the first blood pressure as the blood pressure calibration information; wherein calibrating the initial blood pressure according to the blood pressure calibration information, and using the blood pressure obtained by calibration as the blood pressure of the user, comprises: using the blood pressure calibration information as a direct current component of the blood pressure of the user; using the initial blood pressure as an alternating current component of the blood pressure of the user; calibrating the alternating current component of the blood pressure of the user according to the direct current component of the blood pressure of the user, and using the blood pressure obtained by calibration as the blood pressure of the user. using the blood pressure calibration information as a direct current component of the blood pressure of the user; using the initial blood pressure as an alternating current component of the blood pressure of the user; calibrating the alternating current component of the blood pressure of the user according to the direct current component of the blood pressure of the user, and using the blood pressure obtained by calibration as the blood pressure of the user.