The invention relates to a construction method of an equipment base pre-reservation square hole, in particular to a construction method of an equipment base pre-reservation anchor bolt square hole, which is characterized by comprising the following steps that, firstly, a die is assembled; secondly, the die is erected: the size of an upper hole of the die of the equipment base pre-reservation square hole, which can be repeatedly used, is regulated according to a drawing, a fourth locating nut is unscrewed, a second sliding regulation seat moves downwards so that the rectangular size of the upper hole of an angle template is reached, a second locating nut is unscrewed, a first sliding regulation seat moves downwards so that the rectangular size of a lower hole of the angle template is reached, the third locating nut and a first locating nut are screwed, and a plastic film or an adhesive tape wraps on the outer walls of the angle template and a middle template as a protective layer; thirdly, concrete is poured; fourthly, the template is disassembled, the angle template is extracted, a wood bottom plate is lifted out, and a square hole is left; and fifthly, the hole is cleaned, and the equipment base pre-reservation anchor bolt square hole is acquired. The construction method has the advantages that the operation is simple, die stripping is rapid, and the die can be repeatedly used.