The invention provides a lithium battery allowing the internal temperature and pressure to be detected, belonging to the technical field of battery manufacturing. According to the lithium battery, thetechnical problems that the internal temperature and pressure of an existing lithium battery cannot be conveniently detected, and the like are solved. The lithium battery comprises a battery cell, abase, a cap and a cylindrical shell, wherein the base is fixedly arranged at the lower end of the shell, the cap is fixedly arranged at the upper end of the shell, the battery cell is inserted into the shell, a PCB is arranged at the bottom of the base, and a temperature sensor and a pressure sensor are respectively arranged on one side, facing towards the inside of the shell, of the PCB; and a data transmission wire is connected to the PCB, a through hole is formed in the base, and one end of the data transmission wire penetrates through the through hole and stretches out of the shell. By arranging the temperature sensor and the pressure sensor in the lithium battery, the temperature and the pressure in the shell can be detected in real time, and related numerical values can be transmitted to a detection instrument, so that the internal pressure and temperature parameters of the battery can be timely and accurately evaluated by an operator.