Lifting supporting device and hardness adjusting bed

The utility model provides a lifting supporting device which comprises a fixing plate, a lifting driving assembly and a plurality of sets of fixing ropes are arranged on the fixing plate, and one end of each fixing rope is fixed to the fixing plate; the lifting plate is arranged above the fixing plate and connected with the lifting driving assembly, a telescopic elastic assembly is arranged on the lifting plate, one end of the telescopic elastic assembly is fixed to the lifting plate, and the other end of the fixing rope is connected with the other end of the telescopic elastic assembly and tensioned; the lifting driving assembly drives the lifting plate to ascend relative to the fixing plate so as to compress the telescopic elastic assembly. According to the utility model, the telescopic elastic piece can be compressed through the lifting driving assembly, and the elasticity of the telescopic elastic piece is increased, so that the hardness is adjusted, and a user can adjust the appropriate hardness in time