Electric simulator for tight oil volume fracturing starting pressure gradient permeability rule and testing method

The invention discloses an electric simulator for a tight oil volume fracturing starting pressure gradient permeability rule. The electric simulator comprises a power supply, a switch, a horizontal well volume fracturing fracture net simulating device, an ampere meter, a probe, a voltmeter, a diode and an adjustable resistor, wherein the power supply, the switch, the horizontal well volume fracturing fracture net simulating device and the ampere meter are in series connection to form a closed loop; the probe extends into the horizontal well volume fracturing fracture net simulating device; the voltmeter is connected between the probe and the horizontal well volume fracturing fracture net simulating device in parallel; the diode and the adjustable resistor are connected in the closed loop in series; and one end of the voltmeter is connected with the probe, and the other end of the voltmeter is connected between the diode and the horizontal well volume fracturing fracture net simulating device. The diode is use