A vehicle lifting mechanism for use in a battery swap platform for lifting a vehicle with a battery to be swapped, comprising a columnar shell , with a hoisting mechanism and a slide trolley being mounted in the shell , wherein a lifting arm is connected to the slide trolley , and the lifting arm is used to support a vehicle lifting point; and the hoisting mechanism is connected to the slide trolley to drive the slide trolley to slide in a vertical direction within the shell , so as to implement ascending and descending actions of the lifting arm , one end of the lifting arm is connected to the slide trolley via a connecting plate , and the other end thereof extends in a direction of the vehicle lifting point, the slide trolley comprises a first roller set , and the shell is provided with a guide groove formed by parallel guide rails in a sliding direction of the slide trolley , the first roller set being arranged in the guide groove in a scrollable manner, the slide trolley has a plurality of first roller sets , and the first roller sets are in one-to-one correspondence with the guide grooves, a plurality groups of the guide grooves are respectively provided on a group of inner walls of the shell that face toward each other, and the slide trolley further comprises a second roller set , a circumferential surface of the second roller set resting against a top surface of one of the guide rails , characterized in that the hoisting mechanism is an electric push rod or an electro-hydraulic push rod; and the electric push rod or the electro-hydraulic push rod comprises an electric motor and a push rod portion having a telescopic push rod , the slide trolley is connected to the telescopic push rod , and the electric motor is arranged in parallel with the push rod portion. the hoisting mechanism is connected to the slide trolley to drive the slide trolley to slide in a vertical direction within the shell , so as to implement ascending and descending actions of the lifting arm , one end of the lifting arm is connected to the slide trolley via a connecting plate , and the other end thereof extends in a direction of the vehicle lifting point, the slide trolley comprises a first roller set , and the shell is provided with a guide groove formed by parallel guide rails in a sliding direction of the slide trolley , the first roller set being arranged in the guide groove in a scrollable manner, the slide trolley has a plurality of first roller sets , and the first roller sets are in one-to-one correspondence with the guide grooves, a plurality groups of the guide grooves are respectively provided on a group of inner walls of the shell that face toward each other, and the slide trolley further comprises a second roller set , a circumferential surface of the second roller set resting against a top surface of one of the guide rails , characterized in that the hoisting mechanism is an electric push rod or an electro-hydraulic push rod; and the electric push rod or the electro-hydraulic push rod comprises an electric motor and a push rod portion having a telescopic push rod , the slide trolley is connected to the telescopic push rod , and the electric motor is arranged in parallel with the push rod portion. <EOS>