A safety protection circuit, comprising: N auxiliary switch units (K51... K5N), in a one-to-one association with N first control switch units (K61+... K6N+ or K61-... K6N-), wherein the N first control switch units (K61+... K6N+ or K61-... K6N-) are arranged on power transmission lines of a battery, and N is an integer greater than or equal to 2; a semiconductor switch unit, connected to each first control switch unit (K61+... K6N+ or K61-... K6N-) via an auxiliary switch unit (K51...K5N) corresponding to the first control switch unit (K61+... K6N+ or K61-... K6N-); a control module, configured to receive a target control instruction; enter a target stage, in response to the target control instruction; and in the target stage, control an auxiliary switch unit corresponding to a target switch unit of the N first control switch units to be in a first on-off state, and control the semiconductor switch unit to be in a second on-off state, wherein the target stage comprises a pre-charging stage corresponding to the target switch unit and/or a switching stage during which an on-off state of the target switch unit is switched; under a condition that the target stage comprises the pre-charging stage, the first on-off state is a continuous on state and the second on-off state is an intermittent on state; the safety protection circuit is characterized in that: under a condition that the target stage comprises the switching stage, the first on-off state is the continuous on state and the second on-off state is the continuous on state; the N auxiliary switch units (K51... K5N) are mechanical switches; and the control module is configured to, during the switching stage, firstly control the auxiliary switch unit corresponding to the target switch unit to enter the continuous on state, control the semiconductor switch unit to enter the continuous on state after the target switch unit corresponding to the target switch unit enters the continuous on state, and control the target switch unit to switch from an off state to an on state or switch from the on state to the off state after both the auxiliary switch unit corresponding to the target switch unit and the semiconductor switch unit enter the continuous on state. N auxiliary switch units (K51... K5N), in a one-to-one association with N first control switch units (K61+... K6N+ or K61-... K6N-), wherein the N first control switch units (K61+... K6N+ or K61-... K6N-) are arranged on power transmission lines of a battery, and N is an integer greater than or equal to 2; a semiconductor switch unit, connected to each first control switch unit (K61+... K6N+ or K61-... K6N-) via an auxiliary switch unit (K51...K5N) corresponding to the first control switch unit (K61+... K6N+ or K61-... K6N-); a control module, configured to receive a target control instruction; enter a target stage, in response to the target control instruction; and in the target stage, control an auxiliary switch unit corresponding to a target switch unit of the N first control switch units to be in a first on-off state, and control the semiconductor switch unit to be in a second on-off state, receive a target control instruction; enter a target stage, in response to the target control instruction; and in the target stage, control an auxiliary switch unit corresponding to a target switch unit of the N first control switch units to be in a first on-off state, and control the semiconductor switch unit to be in a second on-off state, wherein the target stage comprises a pre-charging stage corresponding to the target switch unit and/or a switching stage during which an on-off state of the target switch unit is switched; under a condition that the target stage comprises the pre-charging stage, the first on-off state is a continuous on state and the second on-off state is an intermittent on state; the safety protection circuit is characterized in that: under a condition that the target stage comprises the switching stage, the first on-off state is the continuous on state and the second on-off state is the continuous on state; the N auxiliary switch units (K51... K5N) are mechanical switches; and the control module is configured to, during the switching stage, firstly control the auxiliary switch unit corresponding to the target switch unit to enter the continuous on state, control the semiconductor switch unit to enter the continuous on state after the target switch unit corresponding to the target switch unit enters the continuous on state, and control the target switch unit to switch from an off state to an on state or switch from the on state to the off state after both the auxiliary switch unit corresponding to the target switch unit and the semiconductor switch unit enter the continuous on state. under a condition that the target stage comprises the switching stage, the first on-off state is the continuous on state and the second on-off state is the continuous on state; the N auxiliary switch units (K51... K5N) are mechanical switches; and the control module is configured to, during the switching stage, firstly control the auxiliary switch unit corresponding to the target switch unit to enter the continuous on state, control the semiconductor switch unit to enter the continuous on state after the target switch unit corresponding to the target switch unit enters the continuous on state, and control the target switch unit to switch from an off state to an on state or switch from the on state to the off state after both the auxiliary switch unit corresponding to the target switch unit and the semiconductor switch unit enter the continuous on state.