A vacuum energy-saving heat-preservation pressure cooker comprising: a cooker body comprising a cooker body inner layer and a cooker body outer layer, wherein the cooker body inner layer has a side wall and a bottom wall, a containing cavity is formed between the side wall and the bottom wall of the cooker body inner layer, the cooker body inner layer is embedded at an inner side of the cooker body outer layer, the cooker body outer layer is in sealed combination with the side wall of the cooker body inner layer, a first vacuum cavity is formed between the cooker body inner layer and the cooker body outer layer, and the first vacuum cavity is evacuated to be in a vacuum state; a cooker bottom comprising an aluminum layer and a stainless iron layer, wherein the bottom wall of the cooker body inner layer, the aluminum layer, and the stainless iron layer are pressure-welded and closely contacted together; and a cooker cover covering the cooker body, wherein the cooker cover comprises a cooker cover inner layer and a cooker cover outer layer, the cooker cover inner layer is embedded at an inner side of the cooker cover outer layer, the cooker cover inner layer is in sealed combination with the cooker cover outer layer, a second vacuum cavity is formed between the cooker cover inner layer and the cooker cover outer layer, and the second vacuum cavity is evacuated to be in a vacuum state, wherein the cooker cover comprises a shifting fork wheel, two connecting plates and two clamps, a centre of the cooker cover outer layer has a centre hole, the cooker cover outer layer is provided with a fixing screw, the fixing screw is fixed at the centre of the cooker cover outer layer through the centre hole, the shifting fork wheel has a first sleeving hole and two fixing columns, the two fixing columns are located at two sides of the first sleeving hole, respectively, the shifting fork wheel is sleeved at the fixing screw through the first sleeving hole, one end of each of the two connecting plates is sleeved at one of the two fixing columns, each of the clamps has an arc-shaped groove at one side, the two clamps are respectively connected with the other ends of the two connecting plates, and one end of each of the two clamps is fixed at one of edges of opposite sides of the cooker cover outer layer, and the clamps clamp an edge of the cooker cover and an edge of the cooker body through the grooves. a cooker body comprising a cooker body inner layer and a cooker body outer layer, wherein the cooker body inner layer has a side wall and a bottom wall, a containing cavity is formed between the side wall and the bottom wall of the cooker body inner layer, the cooker body inner layer is embedded at an inner side of the cooker body outer layer, the cooker body outer layer is in sealed combination with the side wall of the cooker body inner layer, a first vacuum cavity is formed between the cooker body inner layer and the cooker body outer layer, and the first vacuum cavity is evacuated to be in a vacuum state; a cooker bottom comprising an aluminum layer and a stainless iron layer, wherein the bottom wall of the cooker body inner layer, the aluminum layer, and the stainless iron layer are pressure-welded and closely contacted together; and a cooker cover covering the cooker body, wherein the cooker cover comprises a cooker cover inner layer and a cooker cover outer layer, the cooker cover inner layer is embedded at an inner side of the cooker cover outer layer, the cooker cover inner layer is in sealed combination with the cooker cover outer layer, a second vacuum cavity is formed between the cooker cover inner layer and the cooker cover outer layer, and the second vacuum cavity is evacuated to be in a vacuum state, wherein the cooker cover comprises a shifting fork wheel, two connecting plates and two clamps, a centre of the cooker cover outer layer has a centre hole, the cooker cover outer layer is provided with a fixing screw, the fixing screw is fixed at the centre of the cooker cover outer layer through the centre hole, the shifting fork wheel has a first sleeving hole and two fixing columns, the two fixing columns are located at two sides of the first sleeving hole, respectively, the shifting fork wheel is sleeved at the fixing screw through the first sleeving hole, one end of each of the two connecting plates is sleeved at one of the two fixing columns, each of the clamps has an arc-shaped groove at one side, the two clamps are respectively connected with the other ends of the two connecting plates, and one end of each of the two clamps is fixed at one of edges of opposite sides of the cooker cover outer layer, and the clamps clamp an edge of the cooker cover and an edge of the cooker body through the grooves.