The invention discloses a power battery connection device including a main connecting plug and an auxiliary connecting plug that are plugged together, the main connecting plug includes a main casing, the main casing is provided with a main power supply pin assembly including an anode power supply pin and a cathode power supply pin and an auxiliary power supply pin assembly including a communication power supply pin and a control power supply pin, the auxiliary connecting plug includes an auxiliary casing, the auxiliary casing is provided with a main power supply sleeve assembly including an anode power supply sleeve and a cathode power supply sleeve and an auxiliary power supply sleeve assembly including a communication power supply sleeve and a control power supply sleeve, and a clamp connection mechanism is arranged between the main connecting plug and the auxiliary connecting plug. The power battery connection device can rapidly and conveniently realize the synchronous connection of positive and negative power lines, communication power lines, and control power lines, can guarantee the connection stability and reliability, and the fault caused by the loosening of the power battery connection during the vehicle driving can be prevented.