This application discloses a secondary battery and an apparatus containing the secondary battery. The secondary battery comprises a positive electrode plate comprising a positive active material and a negative electrode plate comprising a negative active material. The negative active material comprises a first material and a second material, the first material comprises artificial graphite, and the second material comprises natural graphite. The positive active material comprises one or more of layered lithium transition metal oxides and modified compounds thereof, and a smoothness L of a surface of the negative electrode film away from the negative electrode current collector satisfies: 40≤L≤50; or the positive active material comprises one or more of lithium-containing phosphates with olivine structure and modified compounds thereof, and a smoothness L of a surface of the negative electrode film away from the negative electrode current collector satisfies: 45≤L≤55.