The invention discloses a mobile terminal based tumble detecting method. The mobile terminal based tumble detecting method comprises the steps as follows: detecting a total accelerated velocity SVM1 and judging whether the total accelerated velocity SVM1 exceeds a set weightlessness threshold Amin; when SVM1 is smaller than Amin, detecting and synthesizing a direction signal omega1 and judging whether the direction signal omega1 exceeds a set inclination angle threshold omegamin; when the omega1 is smaller than the omegamin, detecting a total angular velocity omega and judging whether the total angular velocity omega exceeds a set angular velocity threshold omegamin; when the omega is greater than the omegamin, detecting a total accelerated velocity SVM2; when the total accelerated velocity SVM2 is greater than a set impact acceleration threshold Amax within a set detecting time t1, detecting and synthesizing a direction signal omega2 and judging whether the direction signal omega2 exceeds a set human body tumble gradient threshold omegamax; when the omega2 is less than the omegamax, indicating that the person has tumbled; processing a signal judging that the person has tumbled into a voice prompt signal and an image display signal. By referring to the feature acceleration, the human body inclination state, the angular velocity and the like in the tumble process of the human body and using a built-in sensor in a mobile phone to obtain necessary parameters, the mobile terminal based tumble detecting method can analyze and judge whether the person tumbles.