The invention discloses test equipment and a test method for testing the lateral deformation of a concrete mixture indoors. The test equipment comprises a box, a positioning plate, a horizontal scaleand vertical scales; the box is mainly composed of a bottom plate, a left side wall, a right side wall, a front rotating plate and a rear rotating plate; a leveling plastic steel spacer is arranged atthe bottom of the bottom plate, and the leveling plastic steel spacer is provided with horizontal bubbles; the positioning plate is provided with a round hole at one end, a semicircular opening at the other end, and a hollow groove in the middle; the horizontal scale is defined to slide reciprocally in the hollow groove of the positioning plate through a cylindrical bolt; and four vertical scalesare provided and mounted at four corners of the box respectively. The test equipment and the test method are used for simulating the liquefaction characteristic of road sliding mold construction process concrete vibrated at a high frequency and the lateral deformation when the support of a side wall template is lost after vibration, fill the blank of evaluating the formwork erecting characteristic of the road sliding mold concrete by using only the slump consistency index of the concrete in the industry, and greatly facilitate the construction, research and test.