Abstract: A blender including: a transmission base including a motor support, a motor shaft, a forward driver connected at a top of the motor shaft and a reverse driver rotating in opposite direction to the forward driver; a drive gear coaxially connected at a middle of the motor shaft; a reverse drive gear connected with the reverse driver; a reverse gear set for connecting the drive gear to the reverse drive gear arranged on the base; a blade device including a forward connector connected to the forward driver, a reverse connector connected to the reverse driver, a reverse blade shaft above the reverse connector, a forward blade shaft above the forward connector, the reverse blade shaft being provided with a central hole and connected with a reverse blade, the forward blade shaft being configured for passing through the central hole of the reverse blade shaft and connection with a forward blade.