The present invention relates to a supporter for a trench. More specifically, the present invention includes: a fixing unit adjusting a side wall part forming a plurality of width adjusting ends in a protruding manner so as to correspond to width of a trench and fixing the trench; a support unit fixedly coupled to the center of the trench and supporting the trench; and a supporter unit having an area in contact with the ground, fixedly coupled to the support unit and supporting a load of the trench, wherein the support unit includes: a height adjusting unit forming a plurality of height adjusting ends inclined by being deflected in one direction on both circumferential surfaces in the protruding manner; and a receiving unit receiving the height adjusting unit and forming a height determining part inclined by being deflected in an opposite direction of the height adjusting end in a position corresponding to the height adjusting end in the protruding manner.
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