The invention discloses a tree fixing device for gardens, which comprises a circular ring pre-buried in the soil, a support rod is fixed vertically on both sides of the circular ring, and the upper ends of the support rods extend through the soil to the outside, and are fixed by A cross bar is fixedly installed with bolts, a chute is provided on the surface of the cross bar, and more than one first screw hole is provided on the bottom surface of the chute, a slider is slidably installed in the chute, and a first screw hole is provided on the slider. Two screw holes, one fixing bolt is threaded in the second screw hole, one end of the fixing bolt extends to the corresponding first screw hole, and is threaded with the first screw hole, and the surface of the slider is vertically fixed and installed all the time. pole. The present invention is simple in structure, easy to use, can effectively fix trees, can not affect the normal growth of trees, and can fall automatically after a long time, is convenient for next use and installation.