The utility model relates to a six velocity automobile transmission with single intermediate shaft for full synchronizing device, the transmission is composed of first shaft 1, second shaft 14, intermediate shaft 16, transmitting gears with different steps of various shafts, synchronizers 3, 6, 9 on the second shaft and pulling plate type gearshift control mechanism. The control mechanism is connected with gearshift lateral pull rod 22 through outer gearshift arm 21, the lateral gearshift shaft 29, the gearshift interlocking clearance is arranged between gearshift lateral pull rod and lateral gearshift shaft, the gearshift arm welding assembly 28 is over the clearance, the elastic cylindrical pin 23 is bridge over lateral pull rod and lateral gearshift shaft, the assembly 28 control four pulling plates with different lengths, the pulling plate is connected with shift fork, the connection of every pull plate and relevant shift fork is dissociable, the shift fork is on the shell body of transmission through support pin 30. The utility model relates with compact structure, easy and reliable gearshift control; the most importance is convenient for and disassembly of automobile transmission in the horizontal position.