The invention discloses a drying device for coal, which comprises a latent heat groove and a drying chamber, and is characterized in that: the latent heat groove and the drying chamber are arranged obliquely in parallel; the latent heat groove is communicated with the drying chamber through a leaky pipe; the leaky pipe is provided with a valve; a steam heating pipe is arranged at the bottom of the drying chamber; a condensing chamber is formed on the lateral part of the latent heat groove; a condensed water guiding groove is formed at the bottom of the latent heat groove; the condensing chamber is communicated with the condensed water guiding groove; a plurality of steam flowing through holes are formed on the lateral upper part of the latent heat groove; the latent heat groove is communicated with the condensing chamber through the steam flowing through holes; and an amount control board is arranged inside the drying chamber. The drying device for the coal in the invention can remove internal and external water from the coal, can use latent heat and waste heat, conveys the coal which mainly slides at the inclination of the drying device by gravity without conveying machinery, has the advantages of simple structure, low cost, convenient operation, simple management and high drying efficiency, has multiple comprehensive drying functions such as microwave drying, solar energy drying and the like, and is favorable for of the utilization of steam, hot air, the waste heat and the like.