A touch detection method for capacitive touch keys, comprising: when a touch key is being touched, determining change trends of charge amounts in each charge accumulation region corresponding to a key, where the change trends comprise increment and decrement; performing charge adjustment to each charge accumulation region corresponding to a capacitive touch key until charge amounts in each charge accumulation region corresponding to a capacitive touch key reach stability; calculating charge change amounts in each charge accumulation region when the capacitive touch key is being touched according to charge adjustment amounts in each charge accumulation region corresponding to a capacitive touch key, and calculating the ratio of the charge change amount to a charge balance amount in each charge accumulation region, where the charge balance amount is the charge amount in each charge accumulation region before the capacitive touch key is touched; wherein when the change trend of charge amount in the charge accumulation region corresponding to the capacitive touch key is decrement, and the ratio of the charge change amount to the charge balance amount in the charge accumulation region corresponding to the capacitive touch key is greater than a first threshold referring to a first determination standard and less than a third threshold, or is equal to the first threshold and less than the third threshold, determining the capacitive touch key is being touched; wherein when the change trend of charge amount in the charge accumulation region corresponding to the capacitive touch key is increment, and the ratio of the charge change amount to the charge balance amount in the charge accumulation region corresponding to the capacitive touch key is greater than a second threshold referring to a second determination standard and less than the third threshold, or is equal to the second threshold and less than the third threshold, determining the capacitive touch key is being touched; wherein an insulating dielectric layer is formed on the periphery of each capacitive touch key, a metal layer is formed on the periphery of the insulating dielectric layer, metal shield rings are formed between adjacent capacitive touch keys, and each capacitive touch key is connected with a standard unit capacitor (C hold); wherein the standard unit capacitor (C hold) is a hold capacitor (C hold) in a sampling hold circuit of an analog-to-digital converter, and the discharging of the standard unit capacitor (C hold) is controlled by sampling pulses; and wherein the frequency of the sampling pulses ranges from 80kHz to 120kHz, and the sampling pulses employ a same frequency or the sampling pulses employ different frequencies; wherein the sampling pulses employing different frequencies comprises: after a charge adjustment action for the first time, sampling pulses employing a larger frequency in a current charge adjustment action than that in a previous one. when a touch key is being touched, determining change trends of charge amounts in each charge accumulation region corresponding to a key, where the change trends comprise increment and decrement; performing charge adjustment to each charge accumulation region corresponding to a capacitive touch key until charge amounts in each charge accumulation region corresponding to a capacitive touch key reach stability; calculating charge change amounts in each charge accumulation region when the capacitive touch key is being touched according to charge adjustment amounts in each charge accumulation region corresponding to a capacitive touch key, and calculating the ratio of the charge change amount to a charge balance amount in each charge accumulation region, where the charge balance amount is the charge amount in each charge accumulation region before the capacitive touch key is touched; wherein when the change trend of charge amount in the charge accumulation region corresponding to the capacitive touch key is decrement, and the ratio of the charge change amount to the charge balance amount in the charge accumulation region corresponding to the capacitive touch key is greater than a first threshold referring to a first determination standard and less than a third threshold, or is equal to the first threshold and less than the third threshold, determining the capacitive touch key is being touched; wherein when the change trend of charge amount in the charge accumulation region corresponding to the capacitive touch key is increment, and the ratio of the charge change amount to the charge balance amount in the charge accumulation region corresponding to the capacitive touch key is greater than a second threshold referring to a second determination standard and less than the third threshold, or is equal to the second threshold and less than the third threshold, determining the capacitive touch key is being touched; wherein an insulating dielectric layer is formed on the periphery of each capacitive touch key, a metal layer is formed on the periphery of the insulating dielectric layer, metal shield rings are formed between adjacent capacitive touch keys, and each capacitive touch key is connected with a standard unit capacitor (C hold); wherein the standard unit capacitor (C hold) is a hold capacitor (C hold) in a sampling hold circuit of an analog-to-digital converter, and the discharging of the standard unit capacitor (C hold) is controlled by sampling pulses; and wherein the frequency of the sampling pulses ranges from 80kHz to 120kHz, and the sampling pulses employ a same frequency or the sampling pulses employ different frequencies;