Sand core test piece used for testing performance of drilling fluid and preparation and application thereof

The invention relates to a sand core test piece used for testing the performance of drilling fluid and preparation and application thereof. The sand core test piece consists of a sand sheet and gasket integrated structure. In the sand core test piece, a sand sheet prepared by pressing sand or a natural slabbed core is taken as a leakage medium, and is sealed in a filter press through the gasket to test the infiltration performance of the drilling fluid; meanwhile, the sand core test piece can be washed repeatedly, so the permeability recovery of the sand core test piece is evaluated and the utilization rate of the testing instrument is improved.