A device for simulating injections of liquid chemical substances into soils, comprising: - a support structure, - a first observation chamber which delimits an injectable space suitable for receiving a soil sample characterized by - a second observation chamber which delimits a perforation space suitable for housing at least one stretch of an injection device for injecting the chemical substances, with longitudinal extension along a longitudinal axis of the second observation chamber, wherein the first observation chamber and the second observation chamber are connected to the support structure and are directly bordering to each other in an interface area, wherein the first observation chamber extends from the interface area in radial direction with respect to the longitudinal axis, and is delimited by a first containment wall, wherein the second observation chamber extends from the interface area in direction opposite to the extension of the first observation chamber, and is delimited by a second containment wall, - a retaining partition wall insertable in an inserted position in said interface area so as to separate the injectable space from the perforation space and to prevent the falling of material of the soil sample from the first observation chamber into the second observation chamber, and extractable from the inserted position to an extracted position outside the interface area so as to put the perforation space in communication with the injectable space in the interface area, - one or more first transparent portions formed in the first containment wall and extending from a connecting area between the first observation chamber and the second observation chamber away from the longitudinal axis for viewing in real time a propagation of the chemical substance injected into the soil sample by means of the injection device. - a support structure, - a first observation chamber which delimits an injectable space suitable for receiving a soil sample characterized by - a second observation chamber which delimits a perforation space suitable for housing at least one stretch of an injection device for injecting the chemical substances, with longitudinal extension along a longitudinal axis of the second observation chamber, wherein the first observation chamber and the second observation chamber are connected to the support structure and are directly bordering to each other in an interface area, wherein the first observation chamber extends from the interface area in radial direction with respect to the longitudinal axis, and is delimited by a first containment wall, wherein the second observation chamber extends from the interface area in direction opposite to the extension of the first observation chamber, and is delimited by a second containment wall, wherein the first observation chamber and the second observation chamber are connected to the support structure and are directly bordering to each other in an interface area, wherein the first observation chamber extends from the interface area in radial direction with respect to the longitudinal axis, and is delimited by a first containment wall, wherein the second observation chamber extends from the interface area in direction opposite to the extension of the first observation chamber, and is delimited by a second containment wall, - a retaining partition wall insertable in an inserted position in said interface area so as to separate the injectable space from the perforation space and to prevent the falling of material of the soil sample from the first observation chamber into the second observation chamber, and extractable from the inserted position to an extracted position outside the interface area so as to put the perforation space in communication with the injectable space in the interface area, - one or more first transparent portions formed in the first containment wall and extending from a connecting area between the first observation chamber and the second observation chamber away from the longitudinal axis for viewing in real time a propagation of the chemical substance injected into the soil sample by means of the injection device.