The utility model discloses an experimental device for simulate non - conventional oil gas reservoir micro crack seam belongs to physical simulation technical field. The device includes micro crack slit die type, apron and bottom plate, and the shape assorted recess with micro crack slit die type is offered at the top of bottom plate, and micro crack slit die type inlays to be established in the recess, and two relative intercommunication grooves are offered at the top of bottom plate, and two intercommunication grooves set up in the both sides of recess, and two intercommunication grooves allcommunicate with each other with the recess, and the apron cover is provided with two intercommunicating pores on the apron on the bottom plate, the intercommunicating pore with feed through the groove and correspond the setting, the intercommunicating pore communicates with each other with the intercommunication groove that corresponds. The utility model discloses can protect micro crack slit die type, can bear great pressure, can be in high temperature and high pressure environment experiment.