The invention discloses a vertical loading method for simulating the pile sinking process of a static pressure pile. A body structure comprises a model casing, a soil body, a model bar, self-balanced type loading reaction frame stand columns, stand column linear guide rails, a self-balanced type loading reaction frame lower cross beam, a self-balanced type loading reaction frame upper cross beam, a sucker base, a microcomputer control electro-hydraulic servo jack, a loading data controller, a guiding device horizontal sliding rod, guiding device sliding sleeves, an opening type casing pipe, a fixed base, a force transmission rod and a cushion block. Compared with the prior art, the guiding device horizontal sliding rod can slide freely on the self-balanced type loading reaction frame stand columns through the guiding device sliding sleeves, vertical loading in the pile sinking process of the static pressure pile is simulated, test data are accurate, and the testing efficiency is high.