The invention discloses an LED lamp heat-conducting silicone grease coating device. The LED lamp heat-conducting silicone grease coating device comprises a base, a tray, a stand column, a transverse beam, a net plate assembly, a cutter plate assembly, an air cylinder and a travel switch. When the LED lamp heat-conducting silicone grease coating device works, an LED lamp is put into the tray and the air cylinder acts to tightly press the net plate assembly and the tray; when the air cylinder acts to trigger the travel switch, the air cylinder stops movement, and meanwhile, the cutter plate assembly does reciprocating linear movement on the net plate assembly, so that heat-conducting silicone grease is uniformly distributed on the surface of an LED lamp base plate. The device has a simple structure and can realize automatic coating of the heat-conducting silicone grease; the labor intensity of operators is alleviated; and meanwhile, the heat-conducting silicone grease is uniformly distributed on the surface of the LED lamp base plate so that the heat conduction is uniform and the service life of the LED lamp is prolonged.