The invention discloses a monitoring system and a monitoring method for the support effect of slide-resistant piles. The monitoring system for the support effect of the slide-resistant piles comprises a slide-resistant pile top displacement monitoring unit, a slide-resistant pile and soil body contact surface pressure monitoring unit and a slide-resistant pile body inner part deformation and stress monitoring unit which are connected with a microcomputer through a demodulator. Compared with a current monitoring system, the monitoring system for the support effect of the slide-resistant piles provided by the invention is advantaged in that the monitoring system is a three-dimensional monitoring system which can evaluate the support effect of the slide-resistant piles comprehensively, so that the problems in the monitoring system in the prior art that the monitoring content is single, and the evaluation accuracy is low are solved; and the support effect of the slide-resistant piles are accurately determined through the time series curves of various monitoring variables, and proper supplement treatment measures are taken for slopes with poor treatment effect in time, so that effective protection for objects threatened by landslide mass is realized.