The invention relates to a computer host cooling fan which is convenient to assemble, and comprises a shell, a base and a power supply unit which are respectively assembled on the shell, and a cooling fan which is assembled on the base. The base comprises a base plate, an embedding and hanging mechanism which penetrates through the mounting wall of the casing to enable the base plate to be hung on the side surface of the mounting wall, and a pulling plate which can be pulled out and clamped on the mounting wall to interlock to enable the base plate to be positioned on the mounting wall.

The power supply unit includes a power plug fixed to the mounting wall. The heat dissipation fan is detachably mounted on the base plate and comprises a power connector which is assembled on the base plate and can be electrically connected with the power plug when the base plate is hung on the mounting wall. Through the structural design of the base plate, the fan can be assembled and positioned on the casing without screw fixation, so that the disassembly and assembly of the radiating fan are more convenient and time-saving.