A spring mattress structure comprises a mattress body with a top bed surface and a bottom bed surface which consists of a plurality of shaft levers separated by a regular spacing between any two adjacent shaft levers and prepared for placement of a plurality of springs; each of the springs allows the bottom's both ends to be placed on surfaces of two adjacent shaft levers and develops a hollow space which correspond to a spacing developed by the two adjacent shaft levers; the bottom of each spring is fixed on one of the shaft levers with a spring-loaded locating piece so that the spring is securely connected to the shaft lever.