The utility model discloses an LED light source module with chips directly mounted on a heat pipe. The LED light source module comprises the heat pipe and LED chip arrays, wherein the heat pipe is divided into a cylindrical section and a flat section provided with grooves, and the LED chip arrays are directly mounted on mounting surfaces at bottoms of the grooves of the flat section. The round heat pipe is heated, and the pressure is exerted through male dies, so that one end of the heat pipe is pressed into the flat section provided with the grooves on two sides, and then the surface of the flat section is plated with a reflecting layer; electrodes and stop pieces are placed in the grooves, and then the LED chip arrays are solidified on the mounting surfaces at the bottoms of the grooves through solid crystal materials; then lead bonding is conducted, and the grooves are filled with fluorescence gel for packaging. The LED chip arrays are directly mounted on the surface of the heat pipe, so that the heat resistance of the heat sink from a heat source to the outside can be reduced, and leading-out of the heat is facilitated. The fluorescence gel is directly formed in the grooves of the flat section of the heat pipe, the technology is simple, and the cost is low.