PURPOSE: Provided is a lots-heating device, which can minimize a loss of heat by heating the lots in a closed space, therefore, time of latent heat is extended and heat-distribution of the lots is equalized. CONSTITUTION: The lots-heating device(1) comprises: a main body(3) equipped with a moving means under the main body(3), wherein the upper part of the main body(3) is open; a heating means mounted on the upper part of the main body(3) and heating at fixed temperature by being connected with an outer power circuit; a rotary disk(6) mounted on the upper part of the heating means and having a plurality of lot installing holes(7); a rotary disk operating means; a ventilation means for ventilating air heated by the heating means; a hemispheric closing-means comprising a quarter part(21) fixed to the main body and a door(22, 23) coupled with the quarter part(21), which prevents the heated air from leaking by surrounding the upper part of the rotary disk(6).