The invention relates to a lithium battery protection chip of an integrated power metal oxide semiconductor field effect transistor (MOSFET). The lithium battery protection chip is provided with six pins as follows: a positive power input end VDD, a negative power input end VSS (GND), an overcurrent detection input end/charger detection end CS, a battery core negative electrode end S1, a charging negative electrode end S2 and a power MOSFET drain common end D. The chip comprises a logic controller, an over-charging current comparator, an over-discharging voltage comparator, a short-circuit comparator, a first over-discharging current comparator, a second over-discharging current comparator, a power reset module, an oscillator module, a bandgap reference circuit, a voltage divider, a discharging overcurrent detection module, an MOSFET for charging control and an MOSFET for discharging control. The chip disclosed by the invention has protective functions of over-charging, over-discharging, overcurrent, short-circuit and the like, and the working power consumption is very low; and moreover, the area of a printed circuit board (PCB) of the chip is substantially reduced, and the chip is very suitable for various information product occasions which are very small in space limitation and require a rechargeable lithium battery to supply power for a long time. The chip adopts a small-sized package mode of DFN-5L, the chip area is further reduced, and thus, the chip cost is reduced.