Disclosed is a system, with a water collection groove (110), for protecting against acid rain, the protection system comprising a rainwater collector (1), a rainwater-monitoring meter (2), a telescopic support (3), an electric motor (4) and a canopy (5). The rainwater-monitoring meter (2) is connected to the electric motor (4). The rainwater collector (1) comprises a funnel-shaped rain trap (11) and a rainwater container (12). The rainwater container (12) is fixed to a lower end of the rain trap (11). A side wall, used for collecting rainwater, of the rain trap (11) is provided with the water collection groove (110). The rainwater-monitoring meter (2) is used for detecting a characteristic value of rainwater in the rainwater collector (1), and sending a control signal to the electric motor (4) after the control signal is generated according to the characteristic value. The telescopic support (3) is connected to the electric motor (4). The canopy (5) is fixed to the telescopic support (3). When the telescopic support (3) opens, the canopy (5) opens therewith and when the telescopic support (3) closes, the canopy (5) closes therewith. The system, with the water collection groove (110), for protecting against acid rain can control the start of the electric motor (4) so as to open the telescopic support (3) and the canopy (5) after acid rain is detected, and block the acid rain by means of the canopy (5), thus achieving the effect of protecting soil and plants under the canopy (5).Linvention porte sur un système, équipé dune rainure de captage de leau (110), pour la protection contre les pluies acides, le système de protection comprenant un collecteur deau de pluie (1), un dispositif de mesure deau de pluie (2), un support télescopique (3), un moteur électrique (4) et un auvent (5). Le dispositif de mesure deau de pluie (2) est relié au moteur électrique (4). Le collecteur deau de pluie (1) comprend un piège à pluie en forme dentonnoir (11) et un réservoir deau de pluie
