The invention discloses an air bed body weight measuring method. The air bed body weight measuring method is characterized in that S1, an air bed is provided with initial pressure; S2, a calculating module connected with the air bed is used to determine whether the measurement can be carried out, when the answer is yes, the S3 air bed can be inflated in the first pressure, and when the answer is no, the S1 and the S3 can be carried out; S4, the air bed can be inflated in the second pressure; S5, the air bed can be deflated to the first pressure, and the deflation time can be calculated; S6, the access of the first measurement value can be realized according to the deflation time corresponding to the measurement value control group, and at the same time, whether the patient lying mode is executed can be determined, when the answer is yes, the S8 patient lying mode can be executed, and when the answer is no, the S7 times can be determined, and in addition, the S3 can be carried out, when the times is in the preset range, and the S1 and the S8 can be carried out, when the time is out of the preset range; S9, the measurement module is used to measuring the floating pressure in the air bed, which can be transmitted to the calculating module to acquire the floating pressure preset range, and whether the floating pressure is in the floating pressure preset range can be determined, when the answer is yes, the S8 can be carried out, and when the answer is no, the process can be ended. The air bed pressure can be adjusted according to the differences of the body weight values, the pressure applied on the skins of the patients can be relieved, and the occurrence rate of the bedsore can be reduced.