1. A benchmark updating method for a touch detection terminal capable of eliminating large-area interference, comprising the following steps: step A: powering up a touch detection terminal, establishing a benchmark value in one-to-one correspondence with each touch detection node, and calculating a reference consistency value of the touch screen benchmark according to the established benchmark value, wherein the reference consistency value of the touch screen benchmark is a reference value used to represent closeness among the benchmark values of the touch detection nodes; step B: sampling the touch detection nodes to obtain sampling data of the touch detection nodes, calculating a current consistency value of the touch screen according to the sampling data, and recording a historical minimum value of the current consistency value, wherein the current consistency value of the touch screen is used to represent closeness among the current sampling data of the touch detection nodes; and step C: if the current consistency in the step B is less than the reference consistency value in the step A by a constant value, determining that a currently detected touch operation is a misoperation point after a large-area interference is removed and updating the benchmark and the reference consistency; judging whether the closeness of the current consistency value in the step B to the historical minimum value of the current consistency in the step B is within an allowable range, and if yes, determining that the currently detected touch operation is caused by a large-area interference and updating the benchmark and the reference consistency.