T-shirt printing apparatus of this invention for printing a desired pattern on a T-shirt comprises a support frame, upper and lower turntables rotatably mounted on the support frame, the upper and lower turntables being rotatable relative to each other on a horizontal plane coaxially, at least one print screen attached to the periphery of the upper turntable in a radial direction, a plurality of T-shirt mounting plates attached to the periphery of the lower turntable in a radial direction, the print screen and the T-shirt mounting plates being able to come in alignment with each other along with the relative rotation therebetween, wherein the improvement is characterized in that the printing apparatus further includes a drying device which is capable of drying and heat-treating T-shirts mounted on the T-shirt mounting plates during rotation of the T-shirt mounting plates along with the rotation of said lower turntable. Due to such construction, the operability of the entire printing operation is greatly enhanced.