An electric vehicle thermal management loop, comprising: a driving motor cooling pipe system, comprising an expansion kettle, a first water pump, a driving motor, and a low-temperature radiator connected in sequence; a power battery temperature control pipe system, comprising a second water pump, a battery cooler, and a power battery connected in sequence; a first control pipe system, located between the driving motor cooling pipe system and the power battery temperature control pipe system, the first control pipe system configured to enable the driving motor cooling pipe system and the power battery temperature control pipe system to switch among the following three states: state 1: the driving motor cooling pipe system and the power battery temperature control pipe system forming independent closed loops respectively; state 2: the driving motor cooling pipe system and the power battery temperature control pipe system connected in series to a closed loop; and state 3: the expansion kettle, the first water pump, the driving motor, the second water pump, the battery cooler, and the power battery connected in series to a closed loop; the electric vehicle thermal management loop further comprises a passenger compartment temperature control pipe system, and the passenger compartment temperature control pipe system comprising an electric compressor, an outdoor heat exchanger, an evaporator, a gas-liquid separator, an in-vehicle condenser, and a heat exchange pipe; and characterized in that the passenger compartment temperature control pipe system further comprise a second control pipe system, configured to enable the passenger compartment temperature control pipe system to switch between the following two states: state a, the electric compressor, the outdoor heat exchanger, the evaporator, and the gas-liquid separator connected in series in sequence to form a closed loop, and the heat exchange pipe connected in parallel with the evaporator; and state b, the electric compressor, the in-vehicle condenser, the outdoor heat exchanger, and the gas-liquid separator connected in series in sequence to form a closed loop, and the heat exchange pipe connected in parallel with the outdoor heat exchanger; and the heat exchange pipe passing through the battery cooler to realize heat exchange with the power battery temperature control pipe system. a driving motor cooling pipe system, comprising an expansion kettle, a first water pump, a driving motor, and a low-temperature radiator connected in sequence; a power battery temperature control pipe system, comprising a second water pump, a battery cooler, and a power battery connected in sequence; a first control pipe system, located between the driving motor cooling pipe system and the power battery temperature control pipe system, the first control pipe system configured to enable the driving motor cooling pipe system and the power battery temperature control pipe system to switch among the following three states: state 1: the driving motor cooling pipe system and the power battery temperature control pipe system forming independent closed loops respectively; state 2: the driving motor cooling pipe system and the power battery temperature control pipe system connected in series to a closed loop; and state 3: the expansion kettle, the first water pump, the driving motor, the second water pump, the battery cooler, and the power battery connected in series to a closed loop; the electric vehicle thermal management loop further comprises a passenger compartment temperature control pipe system, and the passenger compartment temperature control pipe system comprising an electric compressor, an outdoor heat exchanger, an evaporator, a gas-liquid separator, an in-vehicle condenser, and a heat exchange pipe; and state 1: the driving motor cooling pipe system and the power battery temperature control pipe system forming independent closed loops respectively; state 2: the driving motor cooling pipe system and the power battery temperature control pipe system connected in series to a closed loop; and state 3: the expansion kettle, the first water pump, the driving motor, the second water pump, the battery cooler, and the power battery connected in series to a closed loop; the electric vehicle thermal management loop further comprises a passenger compartment temperature control pipe system, and the passenger compartment temperature control pipe system comprising an electric compressor, an outdoor heat exchanger, an evaporator, a gas-liquid separator, an in-vehicle condenser, and a heat exchange pipe; and state a, the electric compressor, the outdoor heat exchanger, the evaporator, and the gas-liquid separator connected in series in sequence to form a closed loop, and the heat exchange pipe connected in parallel with the evaporator; and state b, the electric compressor, the in-vehicle condenser, the outdoor heat exchanger, and the gas-liquid separator connected in series in sequence to form a closed loop, and the heat exchange pipe connected in parallel with the outdoor heat exchanger; and the heat exchange pipe passing through the battery cooler to realize heat exchange with the power battery temperature control pipe system.