A secondary battery, comprising a positive electrode plate, a negative electrode plate, a separator and an electrolyte, the positive electrode plate comprising a positive electrode current collector and a positive electrode film disposed on at least one surface of the positive electrode current collector and comprising a positive electrode active material; the negative electrode plate comprising a negative electrode current collector and a negative electrode film disposed on at least one surface of the negative electrode current collector and comprising a negative electrode active material; wherein the positive electrode active material comprises one or more of lithium nickel cobalt manganese oxides and lithium nickel cobalt aluminium oxides; the negative electrode active material comprises a silicon-based material and a carbon material; the negative electrode plate was subjected to prelithiation by pre-supplementing lithium; and characterized in that the secondary battery satisfies: 1.05≤K≤1.25, wherein K=(C 1 /S 1 +C 2 /S 2)/(C 1 /S 1 +C 3 /S 3), in which C 1 denotes a discharge capacity as obtained under the condition that the secondary battery is charged to 4.2V at 0.33C, then charged at a constant voltage of 4.2V till a current is less than or equal to 0.05C, set standing for 30 min and discharged to 2.5V at 0.33C; C 2 denotes a lithum ion deintercalating capacity as measured by taking a negative electrode plate with an area of S 2 from the secondary battery that has experienced the C1 test, and then assembling it with a first lithium plate to form a first button battery, and having the negative electrode plate deintercalated at 0.1C till the first button battery has a voltage of 0.7V; and C 3 denotes a lithum ion intercalating capacity as measured by taking a positive electrode plate with an area of S 3 from the secondary battery that has experienced the C1 test, and then assembling it with a second lithium plate to form a second button battery, and having the positve electrode plate intercalated at 0.1C till the second button battery has a voltage of 2.8V; the S 1 is a total area of the positive electrode film in the secondary battery; the S 1, the S 2 and the S 3 are in mm 2; and the C 1, the C 2 and the C 3 are in mAh, wherein the silicon-based material comprises one or more of elemental silicon, silicon oxides, silicon-carbon compounds, silicon-nitrogen compounds and silicon alloys; and the carbon material comprises one or more of graphite, soft carbon and hard carbon. the positive electrode active material comprises one or more of lithium nickel cobalt manganese oxides and lithium nickel cobalt aluminium oxides; the negative electrode active material comprises a silicon-based material and a carbon material; the negative electrode plate was subjected to prelithiation by pre-supplementing lithium; and characterized in that the secondary battery satisfies: 1.05≤K≤1.25, wherein K=(C 1 /S 1 +C 2 /S 2)/(C 1 /S 1 +C 3 /S 3), in which C 1 denotes a discharge capacity as obtained under the condition that the secondary battery is charged to 4.2V at 0.33C, then charged at a constant voltage of 4.2V till a current is less than or equal to 0.05C, set standing for 30 min and discharged to 2.5V at 0.33C; C 2 denotes a lithum ion deintercalating capacity as measured by taking a negative electrode plate with an area of S 2 from the secondary battery that has experienced the C1 test, and then assembling it with a first lithium plate to form a first button battery, and having the negative electrode plate deintercalated at 0.1C till the first button battery has a voltage of 0.7V; and C 3 denotes a lithum ion intercalating capacity as measured by taking a positive electrode plate with an area of S 3 from the secondary battery that has experienced the C1 test, and then assembling it with a second lithium plate to form a second button battery, and having the positve electrode plate intercalated at 0.1C till the second button battery has a voltage of 2.8V; the S 1 is a total area of the positive electrode film in the secondary battery; the S 1, the S 2 and the S 3 are in mm 2; and the C 1, the C 2 and the C 3 are in mAh, wherein the silicon-based material comprises one or more of elemental silicon, silicon oxides, silicon-carbon compounds, silicon-nitrogen compounds and silicon alloys; and the carbon material comprises one or more of graphite, soft carbon and hard carbon.