Method for keeping revolving platform of automobile crane horizontal and automobile crane

The invention relates to a method for keeping a revolving platform of an automobile crane horizontal and the automobile crane, and the method comprises the following specific steps: arranging a gyroscope on the automobile crane, enabling the gyroscope to be located on a vertical center line of an area enclosed by a plurality of supporting legs of the automobile crane, and enabling the initial height difference between each supporting leg and the gyroscope to be zero by default; a sensor is installed to obtain the distance Hi between the multiple supporting legs and the ground, wherein i = 1-n, and n is the total number of the supporting legs; a plurality of supporting legs of the automobile crane are controlled to stretch out horizontally; the inclination angle of the automobile crane relative to the horizontal plane is detected through a gyroscope; calculating to obtain a height difference Di between the plurality of supporting legs and the gyroscope; the automobile crane is controlled to vertically stretch