The invention discloses a desktop all-in-one computer and mainly relates to the computer field. The computer comprises a body and an auxiliary heat dissipation mechanism, wherein a strip-type ventilation hole communicated with a body inner cavity is formed in the bottom wall of the body, the auxiliary heat dissipation mechanism comprises a connection plate and an air inlet
pipe, the top of the connection plate is connected with the bottom wall of the body, a plurality of ventilation pipes are arranged in the connection plate, refrigerating pipes are arranged on the inner walls of the ventilation pipes, the body inner cavity, the refrigerating pipes and the air inlet
pipe are communicated, a plurality of cooling fans are arranged in the air inlet
pipe, dust filtering covers are arranged atthe
tail ends of the two sides of the air inlet pipe, and dust filtering holes are formed in the dust filtering covers. The desktop all-in-one computer has the advantages that heat dissipation can beperformed on the interior of the desktop all-in-one computer more effectively; when the desktop all-in-one computer is used in winter, warm air can be supplied to both hands controlling a mouse and akeyboard, the situation that both hands are cold and stiff, and consequently fingers are inflexible is avoided, and
hand surface or finger
frostbite caused by long-time usage is avoided; and economicbenefit can be increased for an Internet bar and other business places.