The invention discloses a device for detecting the strength of a cold-rolled stainless steel plate. The device comprises a body, a control panel is arranged at the top of one side of the body, the internal top of the body is rotatably connected with a lever through a screw rod, one end of the lever is fixedly connected with an electro-hydraulic rod, the bottom of a connecting shaft is rotatably connected with the top of a pressure head converter, three pressure heads are symmetrically arranged at the bottom of the pressure head converter, a lead screw pedestal is arranged at the top of one endof the bottom of the body, a lead screw sleeves in the lead screw pedestal, and a spinning roller is in threaded connection with the lead screw. The bottom of the connecting shaft is rotatably connected with the top of the pressure head converter, so different pressure heads can be switched according to practical detection situations in order to detect an object to be detected; and the pressure heads, the control panel, a pressure sensor, the electro-hydraulic rod and a data processor are mutually electrically connected through a battery, so the data processor can control the movement mode ofthe electro-hydraulic rod according to the difference of the used pressure heads in order to smoothly complete detection, and a detection value is displayed on the control panel.