The invention relates to the technical field of lighting devices, and discloses an illuminating lamp convenient for adjusting illuminating range. The illuminating lamp comprises a shell, the inner wall of the shell is movably connected with a lamp holder, the inner wall of the shell is fixedly connected with a slide rheostat, the inner wall of the shell is in threaded connection with a screw rod, the bottom of the screw rod is fixedly connected with a slide block, a connecting rod is fixedly connected to the outer side of the slide block, a contact piece is fixedly connected to the inner side of the connecting rod, a connecting roller is fixedly connected to the inner wall of the shell, and a leather collar is movably connected to the positions, close to the outer side of the connecting roller, of the inner wall of the shell. According to the illuminating lamp convenient for adjusting illuminating range, by changing the resistance value of the slide rheostat, the situation that a night road cannot be seen clearly due to back-and-forth shaking of illuminating lamps is avoided, the illuminating effect is improved, the safety coefficient of night walking is increased, meanwhile, the illuminating lamps are prevented from falling off, damage or even scrapping of the illuminating lamp is avoided, the service life of the illuminating lamps is prolonged, and resources are saved.