The invention discloses a detecting and tracking method of a user walking direction based on portable intelligent equipment. The detecting and tracking method comprises the following steps: firstly, acquiring an acceleration vector and a magnetic field direction vector by the intelligent equipment and estimating a gravitational acceleration vector; determining a geographic coordinate system; performing stepping detection according to the acquired acceleration vector, so as to obtain a velocity vector of one step; projecting the velocity vector on a plane determined by the estimated gravitational acceleration vector, so as to obtain a walking direction vector in the coordinate system of the intelligent equipment; and finally, multiplying the obtained walking direction vector by a transposed matrix of the geographic coordinate system and integrating, so as to obtain a user walking track. According to the method, the portable intelligent equipment can be randomly placed, so as to achieve a good effect; the accuracy is very high under a condition of no magnetic field interference; and the portable intelligent equipment does not need to be placed in a specific manner and can be placed at an optional position such as a pocket of clothes, a pocket of trousers, a hand and the like, and therefore, the walking detection and tracking accuracy is relatively high based on low energy consumption.