The invention discloses a portable luggable computer heat dissipation device which comprises a left base and a right base. A group of damping springs is arranged on the left base and the right base respectively, the upper ends of the damping springs are matched with lifting sleeves, one end of each lifting sleeve is in screwed connection with a lifting bolt, the end of each lifting bolt is rotatably matched with a lifting push block arranged inside the corresponding lifting sleeve, the lifting push blocks are matched with lifting frames arranged inside the lifting sleeves, a group of cooling fans and carriages is arranged on the left base and the right base respectively, the carriage on the left base is connected with the carriage on the right base through a carriage telescoping rod, refrigeration frames penetrate into the carriages, and a group of semiconductor refrigerating sheets are arranged on the refrigeration frames. The portable luggable computer heat dissipation device is stable to place, has the characteristic of stretchable extension, is wide in applicability, can provide good bottom ventilation conditions for a luggable computer, further has a local refrigeration role and has pertinence in heat dissipation.