The invention provides an environment-friendly dry-mixed mortar blender with an online adjustable lubricating device. The dry-mixed mortar blender comprises a stirring shaft, a barrel and a gland, wherein the gland is connected with the barrel through bolts, and the stirring shaft penetrates through the barrel and a central hole of the gland. The dry-mixed mortar blender further comprises a controller, a piston cylinder, a flowmeter and a spring. A controller can be utilized for adjusting the leakage amount under current power according to the working power of the blender, the lubricating andsealing effects are guaranteed, dust leakage is prevented, the environment-friendly effect is improved, and the service life of the blender is prolonged. Therefore, dried powder particles in the blender are prevented from overflowing, the lubricating function is achieved, the friction is reduced, and then the environment-friendly dry-mixed mortar blender with the online adjustable lubricating device can be obtained.