The invention discloses an automobile jack safe to use. The automobile jack safe to use comprises a jack system which is arranged on the bottom face of a base. The jack system comprises an electromagnet, a generator used for providing electric energy for the electromagnet, a permanent magnet and a guide tube, wherein magnetic poles of the permanent magnet are identical with those of the electromagnet, the generator is fixed to the bottom face of the base, one end of the guide tube is connected with the base, the electromagnet is located at the end, connected with the base, in the guide tube, the permanent magnet is inserted and arranged in the guide tube, and a metal supporting part is connected with the end, away from the electromagnet, of the permanent magnet. An LED lamp, an alarming device and a height measuring module are arranged at the end, close to the base, of the guide tube in an embedded mode, the generator supplies power to the LED lamp, the alarming device and the height measuring device, and the height measuring device is connected with the LED lamp and the alarming device through signals. Compared with the prior art, the automobile jack safe to use has the advantages that the jack is convenient to operate, and it can be avoided that an automobile is overturned due to the fact that the jacked height by the jack exceeds a normal value.