The invention discloses a lithium-ion battery pack provided with an overload protection device and a preparation process thereof, comprising a box cover, a handle, a material injection port, a box body, an air inlet, a filter screen, a thermometer, an exhaust port, a lithium battery, Sealing layer, first fixing rod, second fixing rod, dry powder layer, slide rail, fan, limit ring, first fixing block, second fixing block, locking block, second groove, third groove, slide blocks and through holes, the invention draws the cold air from the outside into the box through the motor, and blows the heat from the lithium battery pack out from the air outlet, which is conducive to dissipating a large amount of heat generated by the overload of the lithium battery pack in time, through the box cover. The design of the sealing layer and the dry powder layer avoids the fire caused by the lithium battery pack and improves the safety of the device. By inserting the slider from the third groove on the slide rail and using the locking block, the lithium battery is fully protected. Quick assembly, and convenient disassembly after assembly, greatly improving the practicability of the device.