Controller card reading method and device and electronic equipment

The invention relates to the field of LED display screen controllers, in particular to a controller card reading method and device in an LED display screen and electronic equipment. The controller card reading method comprises the following steps: initiating a query request; reading the cards according to the actual card reading number after obtaining the card reading number; and obtaining the fixed number of bytes and then analyzing the bytes. Wherein after the query request is initiated, query is carried out according to the maximum number of control cards of the system; assuming that the system is fully loaded with n control cards and the query reserved time of each control card is t, performing query according to the query time of n + 1 control cards before startup to ensure that all the control cards can be queried; the query time is gradually shortened, and query is carried out according to n * t time after query is carried out for a certain number of times; and obtaining the maximum value of the number