The invention provides a protecting method for a turbocharger, which comprises the following steps of: before an engine is started, setting an engine oil pressure threshold value; starting the engine, detecting a first pressure value of engine oil in a main oil duct of the engine and comparing the first pressure value with the engine oil pressure threshold value; when the first pressure value is greater than the engine oil pressure threshold value, ensuring an accelerator motor to normally operate and accelerating the engine; and when the first pressure value is less than the engine oil pressure threshold value, automatically locking the accelerator motor, ensuring the engine to operate for T minutes at an idle speed and carrying out real-time detection and comparison on a second pressure value of the engine oil in the main oil duct of the engine and the engine oil pressure threshold value; and when the second pressure value is greater than the engine oil pressure threshold value, relieving the locking of the accelerator motor, ensuring the accelerator motor to normally operate and accelerating the engine. According to the invention, the idling time of the engine is accurately controlled, the damage to the turbocharger is effectively avoided, and the protecting method for the turbocharger is suitable for protecting the turbocharger in all temperature environments.