The invention relates to a lithium ion battery pack for a forklift, and belongs to the technical field of a lithium ion battery. The lithium ion battery pack comprises a power supply box. A power supply box cover is arranged on the top of the power supply box. A first insulation plate is arranged at the lower part of the power supply box. Multiple single batteries are arranged on the first insulation plate. A second insulation plate is above the single batteries. Damping rubber blocks are fixed on the bottom of the second insulation plate. A main control module, a slave control module and a strong electric control module are arranged on the top of the second insulation plate. The single batteries are connected in series to form the battery pack. An anode bus and a cathode bus are leaded out from the battery pack. Voltage signal lines and temperature sensor connection lines on the single batteries are connected with the slave control module. The strong electric control module is connected with the slave control module. The slave control module is connected with the main control module. The battery packet has the advantages of simple and reasonable structure, saving electric energy, long service life, short charging time and high charging/discharging efficiency.