The invention discloses a preheating device for fast eating food, which comprises a main body, a heating mechanism, a drawer box, a placement cavity, a sealing plate, a sliding cap, a third spring, a second limiting block, a fourth spring, an auxiliary block, Opening mechanism and inner bladder. The beneficial effects of the present invention are: when it is necessary to use the main body to heat food, first put the unpacked food into the inner tank inside the main body, then press the drawer box, the second limit block goes over the auxiliary block, and then the drawer is no longer pressed. box, the third spring pushes the box through the sliding cap, the second limit block pushes the auxiliary block to slide to the limit position, the second limit block shrinks into the inside of the drawer box under the inclined side wall of the auxiliary block, at this time The drawer is not limited and fixed, pull the drawer to a suitable position, slide the sealing plate to expose the placement cavity, add the heating material to the interior of the placement cavity, and finally push the drawer directly into the main body, through the replacement of raw materials Setup makes it easy to reuse the main body for food warming.