The invention relates to a lifting machine. The lifting machine comprises a sliding body, a transmission chain, an upright which is arranged perpendicular to the sliding body and the transmission chain, and further comprises an insurance bar, a first clamping buckle, a swing part and a first elastic component. The insurance bar is fixed to the upright and provided with multiple clamping grooves. The first clamping buckle is movably connected with the sliding body, and the first clamping buckle and the swing part are connected with each other; the swing part is movably connected to the sliding body, and one end of the swing part abuts against the side, far away from the insurance bar, of the transmission chain; and the two ends of the first elastic component are connected with the sliding body and the swing part respectively. When the transmission chain breaks, under the tension action of the first elastic component, the swing part drives the first clamping buckle to move towards the insurance bar to make a protrusion of the first clamping buckle buckled with the clamping groove, and the safety of the lifting machine can be improved.